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If x +y=xy=3

0 votes
find x^3+y^3.
asked Nov 16, 2013 in ALGEBRA 1 by andrew Scholar

1 Answer

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x+y=3

xy=3

 

Recall the cubic formula

(x+y)^3=x^3+y^3+3xy(x+y)

Substitute the required values

3^3=x^3+y^3+3*3(3)

27=x^3+y^3+27

x^3+y^3=0

 

answered Nov 16, 2013 by bradely Mentor

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