1 X+2 xy-2 y-9x2.72 – InterviewSolution

1.

1 X+2 xy-2 y-9x2.72

Answer»

Answer:

Given,

3x+2y=12 , xy=6

(3x+2y)^2 =12^2

=9x^2+4y^2+12xy=144

ie, 9x^2+4y^2+(12×6)=144

=9x^2+4y^2+72=144

9x^2+4y^2=144-72

=72.

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