Question

Use the quadratic function to predict f(x) if x equals 8. f(x) = 25x2 − 28x + 585 f(8) = 2679 f(8) = 1614 f(8) = 1961 f(8) = 2201

Answer 1

Option 3rd is correct

f(8) = 1,961

Explanation:

Given the quadratic function:

`f(x) = 25x^2-28x+585` ....[1]

we have to find the value of f(8).

Substitute x = 8 in [1] we have;

`f(8) = 25(8)^2-28(8)+585`

⇒
`f(8) = 25 \cdot 64-224+585`

⇒
`f(8) =1600-224+585`

Simplify:

`f(8) = 1961`

Therefore, the value of
`f(8)` is, 1,961

Answer 2

To predict f(x) when x equals 8 we simply substitute.
So f(x) = 25x2 28x + 585
f(8) = 25 (8)^2 - 28 (8) + 585
f(8) = 25 * 64 - 224 + 585
f(8) = 1600 - 224 + 585 = 1961
Hencse f(8) = 1961