The Power Rule is for taking the derivatives of polynomials ie. The power rule essentially tells you how to differentiate xn. This is a shortcut rule to obtain the derivative of a power function.
Since differentiation is a linear operation on the space of differentiable functions polynomials can also be differentiated using this rule.
A 0 1 a0 1 a 0 1. M b n b nm. 82 8 8 64. It is written as a small number to the right and above the base number.