If 2x-5y=16 and xy=-1 then the value 4x²+25y²= – InterviewSolution

1.

If 2x-5y=16 and xy=-1 then the value 4x²+25y²=

Answer» ONG>Answer:

2X-5y=16

XY =1

4x^2+25y^2

=(2x)^2+(5y)^2

=(2x-5y)^2+2.2x.5y

=(16)^2+20xy

=256+20.1

=256+20

=276

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