Given g(-2)= -4 and g'(-2)=5, find the value of h'(-2) based on the function below. h(x) = (-2x+6) * g(x)

The answer supplies that the derivative of h(x) = (-2x+6) * g(x) is: h(x) = (2x+6) d/dx (g(x)) + g(x) d/dx (2x+6) The concluding answer is: h'(-2) = 58

Please supply in detail how to arrive at both the derivative and the answer, 58. Thank you.