If 3x - 5y = 9 and xy = 24 , find the value of 9x^2 + 25y^2
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3x-5y= 9 ...............[1] and x-y = 24
squraing on both sides
9x²+25y²-2(3x)(5y) = 81
9x²+25y²-30xy = 81
9x² +25y² = 81+30(24) = 81+720
= 801
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krati37:
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