a+b=5 &ab=3 then a cube + b cube
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here is the correct answer
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a+b = 5
ab = 3
( a+b )^3 = a^3 + b^3 + 3ab (a+b)
5^3 = a^3 + b^3 + 3*3*5
125 = a^3 + b^3 + 45
a^3 + b^3 = 125 - 45
a^3 + b^3 = 80
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