Question

If.k(x) = 2(5 – x)2 + 1 (5 - x)2 + 3x , what is the value of k(-7)

Answer 1

We are given the function

`k(x)=2(5-x)^2+1(5-x)^2+3x`

we are asked to find the value of the function at x = -7m therefor we have to replace x for -7 in the function

`k(-7)=2(5-(-7))^2+1(5-(-7))^2+3(-7)`

Simplyfiying

`k(-7)=2(5+7)^2+(5+7)^2-21`
`k(-7)=2(12)^2+(12)^2-21=411`