Find the derivative of the function. y = 5(2 - x)4 Step 1 Apply the general power rule which states that if y = [u(x)"], where u is a differentiable function of x and n is a rational number, then dy = n [u(x)]-1 dx du dx Let u = 2x2 and substitute u for 2 - x in the original equation. - y = 5(2 - x)4 -54(-2x) (2-x2)3 +