Chapter 7 - Exponents and Exponential Functions - 7-3 Multipying Powers with the Same Base - Practice and Problem-Solving Exercises - Page 429: 24

$45x^{7}y^{6}$

Multiply the coefficients : $45x^{5}y^{6}x^{2}$ This is equivalent to : $45x^{5}x^{2}y^{6}$ This becomes : $45x^{5+2}y^{6}$ , since exponents are added while multiplying with the same base Final result : $45x^{7}y^{6}$