Stage 23 · Quadratic Functions

23.5.3 Solving a Quadratic Equation from the Graph

23.5 Quadratic Function × Equation × Inequality

Point 3 of 5

23.5.3 Solving a Quadratic Equation from the Graph

Core idea

Solving ax²+bx+c=0 just asks where the parabola crosses the x-axis, so read off the x-coordinates of the crossings.

Module goal. Connect the parabola's relationship with the x-axis to the roots of a quadratic equation and the solution set of a quadratic inequality.
eastmath.com · 23.5 Quadratic Function × Equation × Inequality · 23.5.3 Solving a Quadratic Equation from the Graph