## Algebra 1

Published by Prentice Hall

# Chapter 7 - Exponents and Exponential Functions - 7-3 Multipying Powers with the Same Base - Practice and Problem-Solving Exercises: 63

#### Answer

$-12x^6 + 40x^4$

#### Work Step by Step

(i) $a^m \cdot a^n = a^{m+n}$ (ii) $x(y-z) = xy - xz$ Use rule (ii) above by multiplying $-4x^3$ to each term of the binomial to obtain: $=-4x^3(3x^3) - (-4x^3)(10x)$ Multiply the coefficients together, and then apply rule (i) above to obtain: $\\=-12x^{3+3}-(-40x^{3+1}) \\=-12x^6-(-40x^4) \\=-12x^6 + 40x^4$

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