Use the values to solve the equation (please help)

Question

Please help my friends and I have been trying this question for an hour.

Q(x)= xg(x)/f(x)

Q'(-1)= ???

f(x)= 1

f'(x) = 3

g(x) = 4

g'(x) = -1

Answer 1

u(x) = x g(x)

u'(x) = (1)g(x) + x g'(x), product rule

Q(x) = u(x) / f(x)

Q'(x) -= [u'(x)f(x) - u(x)f'(x)] / [f(x)]², quotient rule

Can you substitute for u(x) and u'(x), simplify and answer?