5 7*x
d / 5\ --\7*x / dx
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: 35x435 x^{4}35x4
The answer is:
4 35*x
3 140*x
2 420*x