If 2x + y = -5, prove that 8x3+y3 -30xy+125=0
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Step-by-step explanation:
2x+y=-5
(2x+y)^3=(-5)^3
8x^3+y^3+3×2x×y(2x+y)=-125
8x^3+y^3-30xy=-125[2x+y=5]
8x^3+y^3-30xy+125=0
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