Question

Find the value of $f(-3)$ if the function $f\left(x\right)$ is defined as $f\left(x\right)=-8x^2$

• A. -72
• B. 72
• C. 192
• D. -576
• E. 576

Answer 1

Answer: (A)

-72

Given, $f\left(x\right)=-8x^2$

$\Rightarrow f(-3)=-8(-3{)}^2$

$\Rightarrow f(-3)=-8\times 9$

$\Rightarrow f(-3)=-72$