Question

if x+2y=7. prove x^3+8y^3+42xy-343=0​

Answer 1

Step-by-step explanation:

x+2y=7

(x+2y)^3= 7×7×7

x^3+8y^3-(7)^3=0

x^3+8y^3+(3×2×7)xy-343=0

x^3+8y^3+42xy-343=0

Answer 2

Step-by-step explanation:

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