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if 4x-5y=6 and xy=8 then find the value of 16x^2+25y^2​

Sagot :

caylus

Answer:

Hello,

356

Step-by-step explanation:

[tex]4x-5y=6\\xy=8\\\\(4x-5y)^2=16x^2+25y^2-40xy\\\\\\16x^2+25y^2=(4x-5y)^2+40xy=6^2+40*8=356\\[/tex]

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