Grade 9 Math Study Notes
Advanced Mathematics for Junior High School
Course Overview
Grade 9 Mathematics introduces quadratic equations and functions, building on your algebra foundation. You'll also learn about variation relationships, radicals, triangle similarity, and the fundamentals of trigonometry with SOH-CAH-TOA.
What You'll Learn
Quadratic Equations
Four methods to solve any quadratic equation
Quadratic Functions
Graph parabolas and find vertex, axis of symmetry
Variation
Direct, inverse, joint, and combined variation
Radicals
Simplify, add, subtract, multiply, and rationalize
Triangle Similarity
AA, SSS, SAS similarity theorems
Trigonometry Basics
SOH-CAH-TOA and special right triangles
Study Tips for Grade 9 Math
Master the Quadratic Formula
It works for every quadratic equation, so memorize it!
Draw Triangles
Always label sides and angles when doing trigonometry.
Connect Concepts
Quadratics, functions, and graphing are all related!
Memorize Special Triangles
45-45-90 and 30-60-90 appear everywhere in math.
Course Lessons
Quadratic Equations
Master solving quadratic equations through factoring, completing the square, and the quadratic formula
Quadratic Functions
Learn about parabolas, vertex form, and graphing quadratic functions
Variation
Understand direct, inverse, joint, and combined variation relationships
Radicals
Simplify and perform operations with radical expressions
Geometry & Trigonometry
Learn similarity, SOH-CAH-TOA, special triangles, and parallelogram properties
Ready to Test Your Knowledge?
Practice with our comprehensive Grade 9 Math quiz questions!
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