Question

if H(x)=2f(x)*g(x), what is the equation of the tangent line when x= -1?

Answer 1

what is the equation of the tangent line to H when x=-1?

Answer 2

The tangent to H at x=a
is y-H(a)=H'(a)*(x-a)

Answer 3

so replace a with -1
You will need to find H(-1) and H'(-1)