Question

If s(x) = 2-x2 and t(x) = 3x, which value is equivalent to (s° f)(-7)?

Answer 1

-439

Explanation:

Think of the question as s(f(-7))

First replace x with -7 in the equation f(x)= 3x

s(-7) = 3*(-7)

s(-7) = -21

now it is s(-21)

we substitute -21 into the s(x) equation to get
`2-(-21)^2`

That gives you 2-441 = -439