parabolaA parabola consists of points equally far from a fixed line and a fixed point off that line.
You’ll leave with these skills
01Tell which way a parabola opens and where it crosses the y-axisCheck the sign of the number in front of the squared term to see whether the parabola opens up or down, and read the last number as the y-intercept.
02Find a parabola’s vertex from two points at the same heightFind the x-value halfway between two points at the same height, then plug it into the equation to get the vertex’s y-value.
03Pick the form of a quadratic that shows the intercepts or the vertexRead the x-intercepts from the numbers in factored form and the vertex from the numbers in vertex form.
04Find a parabola’s maximum output and where it happensGive the vertex’s y-value when the question asks for the maximum value and its x-value when it asks where the maximum happens.
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
