01Find a parabola’s greatest or least y-value and the x-value where it happensClick the top or bottom of the parabola in Desmos and read the y-value for the greatest or least amount and the x-value for when it happens.
02Tell a parabola’s starting value apart from its zerosClick where the parabola crosses the y-axis to get the starting value, and where it crosses the x-axis to get the x-values that make it zero.
03Solve a quadratic equation that has x on both sidesGraph each side of the equation as its own curve and find the x-values where they cross.
04Test whether two expressions are equivalentGraph overlap helps check equivalence, while algebra and domain checks establish it for every allowed input.
This lesson is part of the full library
207 lessons that teach every skill the SAT tests
71Math
40Reading
24Grammar
10 full-length practice tests to build test-day stamina and confidence
A Desmos simulator to solve math questions faster
A step-by-step guide to every practice test question
The Bluebook Simulator, so test day feels familiar
A drawing for every key term, so new ideas make sense at a glance
