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Find the sum of the coefficients in the polynomial 3(3x^7 + 8x^4 - 7) + 7(x^5 + 7x^2 + 5) when it is fully simplified.

 Feb 16, 2021
 #1
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3(3x7 + 8x4 - 7) + 7(x5 + 7x2 + 5)

= 9x7 + 24x4 - 21 + 7x5 + 49x2 + 35

= 9x7 + 7x5 + 24x4 + 49x2 + 14

 

Sum of coefficients: 9 + 7 + 24 + 49 + 14 = 103, which is your answer :)

 Feb 16, 2021

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