use the distributive property (b^4-9b^5) 3b^2

how to use the distributive property  (b^4-9b^5) 3b^2
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​(b⁴-9b⁵)3b²=3b⁶-27b⁷ because what is outside is multiplied by each of the terms inside the parentheses.

Exponents are added together during multiplication. Coefficients are multiplied. 9×3=27 but b⁴×b²=b⁶ and b⁵×b²=b⁷.

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