If 3x + 2y = 12 and xy = 32 , find the value of 9x square + 4y square
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(3x+2y)^2 = 12^2
3x^2+2y^2+2×3x×2y = 144
9x^2+4y^2+12xy = 144
9x^2+4y^2+12×32 = 144
9x^2+4y^2 = 144-384
9x^2+4y^2 = -240
3x^2+2y^2+2×3x×2y = 144
9x^2+4y^2+12xy = 144
9x^2+4y^2+12×32 = 144
9x^2+4y^2 = 144-384
9x^2+4y^2 = -240
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