Use the foil method to find the product below.

(8x5 + 9)(8x3 + 9)

a. 64x8 + 132x3 + 81
b. 64x8 + 72x5 - 72x3 + 81
c. 64x8 + 72x5 + 72x3 + 81
d. 64x8 + 72x5 + 72x3 + 81x

(8x^5 + 9)(8x^3 + 9)

FOIL...first outside inside last

Fmultiply first terms in each set8x^5 * 8x^3 = 64x^8
O...multiply outside terms in each set8x^5 * 9 = 72x^5
Imultiply inside terms in each set9 * 8x^3 = 72x^3
L...multiply last terms in each set9 * 9 = 81

now we have : 64x^8 + 72x^5 + 72x^3 + 81...and this cant be simplified...so ur answer is C

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