Answer:
x = 5
Explanation:
When two numbers of the same base (3, here) are multiplied, their exponents are added. For 3^2 * 3^x to be equal to 3^7, the exponents are added. So we can write:
Add the exponents: 2 + x = 7
x = 5
3^2 * 3^5 = 3^7 Correct. x is 5