If f(x) = 5x 40, what is f(x) when x = –5?
5(-5)(40)=f(x) you just multiply everything together, so you would get -25*40, which is -1000
f(x)=5x40 so we know that x=5 so f(5)=(55)40 so we have f(5)=2540 and 2540= 1000 so 1000/5=f and f is 200