SOLUTION: Multiply. {{{(5x+7)(x^3-x+7)}}} I got to different answes for it. 1 was {{{5x^2+7x^3-5x^2+28x+49}}} the other was..... {{{5x^4+7x^3-5x^2+28x+49}}} which one is it?

Algebra ->  Exponents-negative-and-fractional -> SOLUTION: Multiply. {{{(5x+7)(x^3-x+7)}}} I got to different answes for it. 1 was {{{5x^2+7x^3-5x^2+28x+49}}} the other was..... {{{5x^4+7x^3-5x^2+28x+49}}} which one is it?      Log On


   

Question 415970: Multiply.
%285x%2B7%29%28x%5E3-x%2B7%29

I got to different answes for it.
1 was 5x%5E2%2B7x%5E3-5x%5E2%2B28x%2B49
the other was..... 5x%5E4%2B7x%5E3-5x%5E2%2B28x%2B49 which one is it?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
(5x+7)(x^3-x+7)
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= 5x(x^3-x+7) + 7(x^3-x+7)
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= 5x^4-5x^2+35x+7x^3-7x+49
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= 5x^4 +7x^3 -5x^2 + 28x + 49
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Cheers,
Stan H.
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