Question

question 6
0/1 pt
when $f(x) = 9x^2 - x - 1$, evaluate $f(-4)$
$f(-4) = $
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Explanation:

Step1: Substitute $x=-4$ into $f(x)$

$f(-4) = 9(-4)^2 - (-4) - 1$

Step2: Calculate the squared term

$(-4)^2 = 16$, so $9\times16 = 144$

Step3: Simplify the linear terms

$-(-4) = 4$, so $144 + 4 - 1$

Step4: Compute final arithmetic

$144 + 4 = 148$; $148 - 1 = 147$

Answer:

147