Let f f and g g be functions such that f(0)=7,g(0)=5, f(0)=7,g(0)=5, f ′ (0)=8, g ′ (0)=6. f′(0)=8,g′(0)=6. Find h ′ (0) h′(0) for the function h(x)=g(x)f(x) h(x)=g(x)f(x) . h ′ (0) h′(0) =