ax+a²x+aby+by-(ax+by)²
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><b><fontface=Copperblacksize=4colour=purple> < b > < marquee direction = "up" > < h3 ><b><marqueedirection="up"><h3> Given :
ax + a²x + aby + by - ( ax - by )²
{ Using identity -
( x - y )² = x² - 2xy + y² }
= ax + a²x + aby + by - [ ( ax )² - 2 ( ax ) ( by ) + ( by )² ]
= ax + a²x + aby + by - ( a²x² - 2abxy + b²y² )
= ax + a²x + aby + by - a²x² + 2abxy - b²y²
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