Answer:
The sum of the coefficients is 85.
Explanation:
(3x + 7)(7x + 5)3x * 7x is 21x^23x*5 is 15x
7 * 7x is 49x
7 * 5 is 35
21x^2 + 15x + 49x + 35
So the answer is 21x^2 + 64x + 35
Add the coefficients: 21 + 64 = 85
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