MathLab with Mr. Ahmed

MathLab with Mr. Ahmed is a math learning website by Ahmed Amasha, a mathematics teacher teaching the American curriculum. Explore Algebra 2, Precalculus, Calculus, and SAT and PSAT Math Prep through lessons, focused practice and printable resources.

MathLabwith Mr. Ahmed
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Nonlinear functions (graphs)

Question 1 of 3

Know the idea

The graph of y=f(x)y = f(x) is shown, where ff is a quadratic function.−6−4−2246−6−5−4−3−2−112xyWhat is the sum of the xx-intercepts of the graph?
Worked example
The graph crosses the xx-axis at x=−3x = -3 and x=−1x = -1. Their sum is −4-4.
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The graph of a quadratic function has vertex (9,9)(9, 9). A horizontal line above the vertex intersects the parabola at x=7x = 7 and x=bx = b. What is bb?