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(x10 - x7)(x3 - 7)

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1 Answer

 
First: (x^10)(x^3)  = x^13
 
Outside = (x^10) (-7) = -7x^10
 
Inside = (-x^7)(x^3) = -x^10
 
Last = (-x^7)(-7) = 7x^7
 
x^13 - 7x^10 -x^10 + 7x^7
 
 
 
X^13 - 8x^10 + 7x^7