Chapter 7 - Exponents and Exponential Functions - 7-2 Multiplying Powers With the Same Base - Practice and Problem-Solving Exercises - Page 429: 8

$7^{7}$

When we multiply two numbers with different exponents but the same base, we raise the base to the power of the two exponents added together. Thus, we know that 7 should be raised to the power of 3+4, which equals 7.