Respuesta :

Answer:

The sum of the coefficients is 85.

Step-by-step explanation:

(3x + 7)(7x + 5)
3x * 7x is 21x^2
3x*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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