# How do you fill in the blank for the expression 9^3*9^?=9^7?

Apr 19, 2018

${a}^{n} \times {a}^{n} = {a}^{n - m}$
9^3 xx 9^? = 9^7
9^(3+?) = 9^7
3 + ? = 7
? = 4