1.

14. lf 3x + 4y = 16 and xy=4; find the value of92 + 169

Answer»

3x+4y=16

Squaring on both sides

(3x+4y)^2=256

(3x)^2+(4y)^2 +24xy=256

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

Answer is 160

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