C. 3x^2-3x-60 Hope it helps
Answer:
C. 3x2 − 3x − 60
Explanation:
3(x + 4) (x - 5) = (3x+12) (x-5)
(3x+12) (x-5) = 3x2+12x-15x-60
3x2+12x-15x-60 = 3x2 − 3x − 60
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