4 5*x
d / 4\ --\5*x / dx
The derivative of a constant times a function is the constant times the derivative of the function.
Apply the power rule: x4x^{4}x4 goes to 4x34 x^{3}4x3
So, the result is: 20x320 x^{3}20x3
The answer is:
3 20*x
2 60*x
120*x