Question

5 raise to x+1 - 5 raise to x =500

Answer 1

your answer is in above pic.

Answer 2

5x+1 − 5x = 500⇒5x(5 − 1) = 500⇒5x . 4 = 500⇒5x  = 5004⇒5x = 125⇒5x = 53⇒x = 3