5 4*x
4*x^5
The derivative of a constant times a function is the constant times the derivative of the function.
Apply the power rule: x5x^{5}x5 goes to 5x45 x^{4}5x4
So, the result is: 20x420 x^{4}20x4
The answer is:
4 20*x
3 80*x
2 240*x