Question

Sendo a função f(x) = 4x³ +8x² - 2 . x + 13, determine o valor de 9.f (3)

Answer 1

1,863

Explanation:

First thing to do here is to substitute 3 for the value of x

f(3) =4)3)^3 + 8(3)^2 -2(3) + 13

= 4(27) + 8(9) -6 + 13

= 108 + 72 + 7 = 207

we now multiply this result by 9

= 9 * 207 = 1,863

Answer 2

The value of 9f(3) is 1683.

Explanation:

This is a compound function, so let's call it
`g`, where it is equal to:

`g = 9*f(3)`

To solve it, we need to find
`f(3)` and apply it on the expression above, this is done below:

`f(3) = 4*(3)^3 + 8*(3)^2 - 2*3 + 13\\f(3) = 4*27 + 8*9 - 6 + 13\\f(3) = 108 + 72 + 7\\f(3) = 187\\`

Applying it on
`g` we have:

`g = 9*187 =1683`