Question

if x+2y= 3 and xy= 2 then prove that: x^3+8y^3+9 = 0

Answer 1

Answer:

I can prove it

Step-by-step explanation:

x+2y=3

xy=2

(x+2y)³=x³+8y³+3x(2y)(x+2y)=3³

x³+8y³+6(2)(3)=27

x³+8y³+36=27

x³+8y³+9=0

HENCE PROVED

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