factorise the following expresion :- 1) (a)^ 2 +(b)^2-2ab-(x)^2-(y)^2-2xy and 2) (x) ^2+80+18x
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a^2 + b^2 - 2ab - x^2 - y^2 - 2xy
= ( a - b )^2 - ( x^2 + y^2 + 2xy )
= ( a - b )^2 - ( x + y )^2
2 )
x^2 + 80 + 18x
= x^2 + 18x + 80
= x^2 + 10x + 8x + 80
= x ( x + 10 ) + 8 ( x + 10 )
= ( x + 10 ) ( x + 8 )
= ( a - b )^2 - ( x^2 + y^2 + 2xy )
= ( a - b )^2 - ( x + y )^2
2 )
x^2 + 80 + 18x
= x^2 + 18x + 80
= x^2 + 10x + 8x + 80
= x ( x + 10 ) + 8 ( x + 10 )
= ( x + 10 ) ( x + 8 )
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