if 2x+3y=15 and xy=6 so solve 4xsquare +9ysquare
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(2x+3y)2= (15)2
4x2+12xy+9y2=225
4x2+12*6+9y2=225
4x2+72+9y2=225
therefore,
4x2+9y2=225-72
4x2+9y2=153
4x2+12xy+9y2=225
4x2+12*6+9y2=225
4x2+72+9y2=225
therefore,
4x2+9y2=225-72
4x2+9y2=153
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