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Question

Factorise : 75(x+y)248(xy)2

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Solution

75(x+y)248(xy)2=3[25(x+y)216(xy)2]=3[{5(x+y)2}{4(xy)}2]Using a2b2=(a+b)(ab)=3[5(x+y)+4(xy)][5(x+y)4(xy)]=3[5x+5y+4x4y][5x+5y4x+4y]=3(9x+y)(x+9y)


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