Answer:
C. (x + 8) (x + 7)
Step-by-step explanation:
<em><u>To factor this trinomial, you must split the middle term (15x) into two terms that can be added to get 15x, and multiplied to get 56:</u></em>
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<em><u>Group:</u></em>
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<em><u>Take out the GCF (Greatest Common Factor):</u></em>
x(x + 7) 8(x + 7)
(x + 8) (x + 7)