Question

If s(x) =2-x^2and t(x) =3x which value is equivalent to (s·t)(-7) ​

Answer 1

987

Explanation:

(s.t)(x) = s(x) × t(x) = 3x(2 - x²) = 6x - 3x³

To evaluate (s.t)(- 7) substitute x = - 7 into the product

(s.t)(- 7) = 6(- 7) - 3(- 7)³ = - 42 + 1029 = 987

Answer 2

the answer is 24 (x) -78