Question

Given the function f(x) = - 5x² – 13x – 5, f(20) = ???

Answer 1

$f(20) = - 5 \times {20}^{2} - 13 \times 20 - 5$

$f(20) = - 5 \times 400 - 260 - 5$

$f(20) = - 2000 - 260 - 5$

$f(20) = - 2265$

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And we're done.

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Answer 2

Answer:

-2265

Step-by-step explanation:

First, we replace x with 20.

$f(20)=-5*20^2-13*20-5$

Then, we evaluate.

The * stands for multiplication.

$f(20)=-5*20^2-13*20-5\\-5*400-260-5\\-2000-260-5\\-2265$