Question

Given the function f (x) = 8x2 - 14x – 10, find f -2).

Answer 1

Remember from now on ;

If the value of f(x) is asked, we put what thing written in parentheses inside the function instead of x. It doesn't different what is written, we just have to replace it with x.

Got it ?

Now Let's do it .....

`f( x) = 8 {x}^(2) - 14x - 10`

`f( - 2) = 8({ - 2})^(2) - 14( - 2) - 10 \\`

`f( - 2) = 8 * 4 + 28 - 10`

`f( - 2) = 32 + 28 - 10`

`f( - 2) = 60 - 10`

`f( - 2) = 50`

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And we're done...

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