Use the graphing calculator to graph the quadratic function y = x2 − 5x − 36. Which value is a solution of 0 = x2 − 5x − 36?
Answer
A
−9
B
−4
C
4
D
6
Explanation
Set the quadratic equal to zero and factor: x² − 5x − 36 = (x − 9)(x + 4). The product is zero when x = 9 or x = −4, so −4 is a solution and is choice B.
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