Question

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

Answer 1

`f(20) = - 5 * {20}^(2) - 13 * 20 - 5 \\`

`f(20) = - 5 * 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

-2265

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`