Use the FOIL method to find the product below? (9x5 + 8)(9x3 + 8) A. 72x8 + 72x3 + 64 B. 81x8 + 72x5 + 72x3 + 64 C. 81x8 + 144x5 + 64 D. 81x8 + 72x5 + 72x3 + 64x

1 Answer
LM
May 28, 2018

#B#

Explanation:

F: (firsts)

#9x^5 * 9x^3 = 81 * x^(5+3) = 81x^8#

O: (outsides)

#9x^5 * 8 = 72x^5#

I: (insides)

#8 * 9x^3 = 72x^3#

L: (lasts)

#8 * 8 = 64#

adding these results gives

#81x^8 + 72x^5 + 72x^3 + 64#

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