SOLUTION: Foil (7x^4-8)(x^8-1) I do not understand what to do with the (7x^4)*(x^8) 7x^4*-1=-7x^4 -8*x^8=-8x^8 -8*-1=8

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Foil (7x^4-8)(x^8-1) I do not understand what to do with the (7x^4)*(x^8) 7x^4*-1=-7x^4 -8*x^8=-8x^8 -8*-1=8      Log On


   

Question 394476: Foil (7x^4-8)(x^8-1)
I do not understand what to do with the (7x^4)*(x^8)
7x^4*-1=-7x^4
-8*x^8=-8x^8
-8*-1=8
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
(7x^4-8)(x^8-1)
I do not understand what to do with the (7x^4)*(x^8)
Add the exponents.
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= 7x^12 - 8x^8 - 7x^4 + 8