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If x +y=xy=3

0 votes

find x^3+y^3.

cubic
formula

asked Nov 16, 2013 in ALGEBRA 1 by andrew Scholar

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1 Answer

0 votes

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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