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Mathematics 8 Online
OpenStudy (anonymous):

8x(x^2+7x-7)

OpenStudy (anonymous):

is this correct? 8x^3+56x^2-7?

hero (hero):

For this one you can either use distributive property or top down method: Distributive property: a(b + c + d) = ab + ac + ad

hero (hero):

8x(x^2 + 7x - 7) = (8x*x^2) + (8x*7x) - (8x*7)

OpenStudy (anonymous):

im confused is what I have not correct?

hero (hero):

You forgot to multiply -(8x*7) for the last term

OpenStudy (anonymous):

so its 8x^3+56^2-56?

hero (hero):

8x^3 + 56x^2 - 56

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