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Course: Digital SAT Math > Unit 4

Lesson 11: Quadratic graphs: foundations
Test prep
Digital SAT Math
Foundations: Advanced math
Quadratic graphs: foundations
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Quadratic graphs: foundations

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Problem

The function f(x)=(4-x)(x+2) is graphed in the xy-plane. The graph is a parabola that opens downward. The graph crosses the x-axis at -2 and 4. The graph crosses the y-axis at 8. The graph changes from increasing to decreasing at the point (1, 9).
The graph of f(x)=(4−x)(x+2) is shown in the xy-plane. What are the coordinates of the zero(s) of f ?
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