#
Precalculus

Here is a list of all of the skills students learn in Precalculus! These skills are organized into categories, and you can move your mouse over any skill name to preview the skill. To start practicing, just click on any link. IXL will track your score, and the questions will automatically increase in difficulty as you improve!

## Functions

- A.1 Domain and range
- A.2 Identify functions
- A.3 Evaluate functions
- A.4 Find values using function graphs
- A.5 Complete a table for a function graph
- A.6 Find the slope of a linear function
- A.7 Graph a linear function
- A.8 Write the equation of a linear function
- A.9 Linear functions over unit intervals
- A.10 Average rate of change
- A.11 Add, subtract, multiply, and divide functions
- A.12 Composition of functions
- A.13 Identify inverse functions
- A.14 Find values of inverse functions from tables
- A.15 Find values of inverse functions from graphs
- A.16 Find inverse functions and relations

## Families of functions

## Quadratic functions

- C.1 Find the maximum or minimum value of a quadratic function
- C.2 Characteristics of quadratic functions
- C.3 Graph a quadratic function
- C.4 Match quadratic functions and graphs
- C.5 Solve a quadratic equation using square roots
- C.6 Solve a quadratic equation by factoring
- C.7 Solve a quadratic equation by completing the square
- C.8 Solve a quadratic equation using the quadratic formula
- C.9 Using the discriminant

## Polynomials

- D.1 Divide polynomials using long division
- D.2 Divide polynomials using synthetic division
- D.3 Evaluate polynomials using synthetic division
- D.4 Find the roots of factored polynomials
- D.5 Write a polynomial from its roots
- D.6 Rational root theorem
- D.7 Complex conjugate theorem
- D.8 Conjugate root theorems
- D.9 Descartes' Rule of Signs
- D.10 Fundamental Theorem of Algebra
- D.11 Match polynomials and graphs
- D.12 Factor sums and differences of cubes
- D.13 Solve equations with sums and differences of cubes
- D.14 Factor using a quadratic pattern
- D.15 Solve equations using a quadratic pattern
- D.16 Pascal's triangle
- D.17 Pascal's triangle and the Binomial Theorem
- D.18 Binomial Theorem I
- D.19 Binomial Theorem II

## Rational functions

## Exponential and logarithmic functions

- F.1 Domain and range of exponential and logarithmic functions
- F.2 Convert between exponential and logarithmic form
- F.3 Solve exponential equations using factoring
- F.4 Evaluate logarithms
- F.5 Change of base formula
- F.6 Product property of logarithms
- F.7 Quotient property of logarithms
- F.8 Power property of logarithms
- F.9 Evaluate logarithms using properties
- F.10 Solve exponential equations using logarithms
- F.11 Solve logarithmic equations with one logarithm
- F.12 Solve logarithmic equations with multiple logarithms
- F.13 Exponential functions over unit intervals
- F.14 Identify linear and exponential functions
- F.15 Describe linear and exponential growth and decay
- F.16 Exponential growth and decay: word problems
- F.17 Compound interest: word problems

## Radical functions

## Roots and rational exponents

## Systems of equations

- I.1 Solve a system of equations by graphing
- I.2 Solve a system of equations by graphing: word problems
- I.3 Classify a system of equations
- I.4 Solve a system of equations using substitution
- I.5 Solve a system of equations using substitution: word problems
- I.6 Solve a system of equations using elimination
- I.7 Solve a system of equations using elimination: word problems
- I.8 Solve a system of equations in three variables using substitution
- I.9 Solve a system of equations in three variables using elimination
- I.10 Determine the number of solutions to a system of equations in three variables

## Systems of inequalities

## Nonlinear inequalities

## Matrices

- L.1 Matrix vocabulary
- L.2 Matrix operation rules
- L.3 Add and subtract matrices
- L.4 Multiply a matrix by a scalar
- L.5 Add and subtract scalar multiples of matrices
- L.6 Multiply two matrices
- L.7 Simplify matrix expressions
- L.8 Properties of matrices
- L.9 Solve matrix equations
- L.10 Determinant of a matrix
- L.11 Is a matrix invertible?
- L.12 Inverse of a 2 x 2 matrix
- L.13 Inverse of a 3 x 3 matrix
- L.14 Identify inverse matrices
- L.15 Solve matrix equations using inverses
- L.16 Identify transformation matrices
- L.17 Transformation matrices: write the vertex matrix
- L.18 Transformation matrices: graph the image

## Trigonometry

- M.1 Convert between radians and degrees
- M.2 Radians and arc length
- M.3 Quadrants
- M.4 Coterminal and reference angles
- M.5 Find trigonometric ratios using right triangles
- M.6 Find trigonometric ratios using the unit circle
- M.7 Find trigonometric ratios using reference angles
- M.8 Inverses of trigonometric functions
- M.9 Solve trigonometric equations
- M.10 Trigonometric ratios: find a side length
- M.11 Trigonometric ratios: find an angle measure
- M.12 Solve a right triangle
- M.13 Law of Sines
- M.14 Law of Cosines
- M.15 Solve a triangle
- M.16 Area of a triangle: sine formula
- M.17 Area of a triangle: Heron's formula

## Trigonometric functions

- N.1 Find properties of sine functions
- N.2 Write equations of sine functions from graphs
- N.3 Write equations of sine functions using properties
- N.4 Graph sine functions
- N.5 Find properties of cosine functions
- N.6 Write equations of cosine functions from graphs
- N.7 Write equations of cosine functions using properties
- N.8 Graph cosine functions
- N.9 Graph sine and cosine functions

## Trigonometric identities

## Conic sections

- P.1 Find properties of parabolas
- P.2 Write equations of parabolas in vertex form
- P.3 Graph parabolas
- P.4 Find properties of circles
- P.5 Write equations of circles in standard form
- P.6 Graph circles
- P.7 Find properties of ellipses
- P.8 Find the eccentricity of an ellipse
- P.9 Write equations of ellipses in standard form
- P.10 Find properties of hyperbolas
- P.11 Find the eccentricity of a hyperbola
- P.12 Write equations of hyperbolas in standard form
- P.13 Convert equations of conic sections from general to standard form

## Real numbers

## Complex numbers

## Polar form

## Two-dimensional vectors

- U.1 Find the magnitude of a vector
- U.2 Find the component form of a vector
- U.3 Find the direction angle of a vector
- U.4 Find the component form of a vector from its magnitude and direction angle
- U.5 Graph a resultant vector using the triangle method
- U.6 Graph a resultant vector using the parallelogram method
- U.7 Add and subtract vectors
- U.8 Find the magnitude and direction of a vector sum
- U.9 Multiply a vector by a scalar
- U.10 Find the magnitude of a vector scalar multiple
- U.11 Determine the direction of a vector scalar multiple
- U.12 Find a unit vector
- U.13 Linear combinations of vectors

## Three-dimensional vectors

- V.1 Find the magnitude of a three-dimensional vector
- V.2 Find the component form of a three-dimensional vector
- V.3 Add and subtract three-dimensional vectors
- V.4 Scalar multiples of three-dimensional vectors
- V.5 Find a three-dimensional unit vector
- V.6 Linear combinations of three-dimensional vectors

## Sequences and series

- W.1 Find terms of a sequence
- W.2 Find terms of a recursive sequence
- W.3 Identify a sequence as explicit or recursive
- W.4 Find a recursive formula
- W.5 Find recursive and explicit formulas
- W.6 Convert a recursive formula to an explicit formula
- W.7 Convert an explicit formula to a recursive formula
- W.8 Convert between explicit and recursive formulas
- W.9 Identify arithmetic and geometric series
- W.10 Introduction to sigma notation
- W.11 Find the sum of a finite arithmetic or geometric series
- W.12 Introduction to partial sums
- W.13 Partial sums of arithmetic series
- W.14 Partial sums of geometric series
- W.15 Partial sums: mixed review
- W.16 Convergent and divergent geometric series
- W.17 Find the value of an infinite geometric series
- W.18 Write a repeating decimal as a fraction

## Probability

- X.1 Introduction to probability
- X.2 Calculate probabilities of events
- X.3 Combinations and permutations
- X.4 Find probabilities using combinations and permutations
- X.5 Find probabilities using two-way frequency tables
- X.6 Identify independent events
- X.7 Find conditional probabilities
- X.8 Independence and conditional probability
- X.9 Find conditional probabilities using two-way frequency tables
- X.10 Find probabilities using the addition rule

## Probability distributions

- Y.1 Identify discrete and continuous random variables
- Y.2 Write a discrete probability distribution
- Y.3 Graph a discrete probability distribution
- Y.4 Expected values of random variables
- Y.5 Variance of random variables
- Y.6 Standard deviation of random variables
- Y.7 Write the probability distribution for a game of chance
- Y.8 Expected values for a game of chance
- Y.9 Choose the better bet
- Y.10 Find probabilities using the binomial distribution
- Y.11 Mean, variance, and standard deviation of binomial distributions
- Y.12 Find probabilities using the normal distribution
- Y.13 Find z-values
- Y.14 Find values of normal variables
- Y.15 Distributions of sample means
- Y.16 The Central Limit Theorem
- Y.17 Use normal distributions to approximate binomial distributions

## Statistics

- Z.1 Identify biased samples
- Z.2 Variance and standard deviation
- Z.3 Identify an outlier
- Z.4 Identify an outlier and describe the effect of removing it
- Z.5 Outliers in scatter plots
- Z.6 Match correlation coefficients to scatter plots
- Z.7 Calculate correlation coefficients
- Z.8 Find the equation of a regression line
- Z.9 Interpret regression lines
- Z.10 Analyze a regression line of a data set
- Z.11 Analyze a regression line using statistics of a data set
- Z.12 Find confidence intervals for population means
- Z.13 Find confidence intervals for population proportions
- Z.14 Interpret confidence intervals for population means
- Z.15 Experiment design
- Z.16 Analyze the results of an experiment using simulations