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14. If 3x + 4y = 16 and xy = 4; find the value of9x2 16y2mher T

Answer»

Given (3x + 4y) = 16 andxy = 4

(3x + 4y)^2 = 9x^2 + 16y^2 + 24xy

16*16 = 9x^2 + 16y^2 + 24*4

9x^2 + 16y^2 = 256 - 96= 160



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