Answer:
c = 15
Explanation:
expand the left side and compare with like terms on the right side
2x(4x + 5) + 3(4x + 5) ← distribute parenthesis
= 8x² + 10x + 12x + 15 ← collect like terms
= 8x² + 22x + 15
compare to ax² + bx + c
then c = 15
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