1.

If x^3 + y^3=54 and x+y= 6, what is value of xy?

Answer»

ANSWER:

(x+y)³ = x³ + y³ + 3XY(x+y)

(6)³ = 54 + 3xy(6)

216 -54 = 18xy

162/18 = xy

xy = 9



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