solve (x^2-x-1)(x^2-x-7)

Hi, 

Assuming that you have to multiplyx2-x-1x2-x-7=x4-x3-7x2-x3+x2+7x-x2+x+7=x4-2x3-7x2+8x+7
Regards

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x^7-2x^3-7x^2+x+7
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