7 4*x
4*x^7
The derivative of a constant times a function is the constant times the derivative of the function.
Apply the power rule: x7x^{7}x7 goes to 7x67 x^{6}7x6
So, the result is: 28x628 x^{6}28x6
The answer is:
6 28*x
5 168*x
4 840*x