Question

If s(x) = 2 – x^2 and t(x) = 3x, which value is equivalent to (s•t)(-7)?

Answer 1

`-439`

Explanation:

we have

`s(x)=2-x^(2)`

`t(x)=3x`

we know that

`(sot)(x)=2-(3x)^(2)`

`(sot)(x)=2-9x^(2)`

For x=-7

substitute

`(sot)(-7)=2-9(-7)^(2)`

`(sot)(-7)=2-441`

`(sot)(-7)=-439`