Mahesh Godavarti
1
I think you are asking: Is x^{-2} \times 25x = 25 x^{-1} ? and why. The main thing to note here is that x^{-n} = \frac{1}{x^n} for all values of n . Therefore, 25 \times \frac{1}{x^2} \times x = 25 \times \frac{1}{x} .