Answer:
21x^2 - 25x - 28
Explanation:
= -3x (4 - 5x) + (3x + 4)(2x - 7)
= -12x + 15x^2 + 6x^2 - 21x + 8x - 28
= 21x^2 - 25x - 28
I hope my answer helps you.
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