Question

If f(x) = 4 – x^2 and g(x) = 6x, which expression is equivalent to (g – f)(3)?

Answer 1

23

Explanation:

f(x)=4-x²

g(x)=6x

g(x)-f(x)=6x-(4-x²)

g(x)-f(x)=6x-4+x²

so, when (g-f)(3), it means that x=3

.:(g-f)(3)=6(3)-4+(3)²

= 18 - 4 +9

=14+9

=23