if 3x-4y=16 and xy = 4 , find the value of 9x^2+16y^2
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the value of 9x^2+16y^2
(3x-4y)^2 = 9x^2+16y^2 - 24 xy
= ) 16*16-96 = 9x^2+16y^2
=) 160 = 9x^2+16y^2
(3x-4y)^2 = 9x^2+16y^2 - 24 xy
= ) 16*16-96 = 9x^2+16y^2
=) 160 = 9x^2+16y^2
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