algebraic identities
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An algebraic identity is an equality that holds for any values of its variables. For example, the identity ( x + y ) 2 = x 2 + 2 x y + y 2 (x+y)^2 = x^2 + 2xy + y^2 (x+y)2=x2+2xy+y2 holds for all values of x and y.
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1.(a+b)²= a²+ b²+2ab
2.(a-b)²= a²-2ab +b²
3.(a+b)(a-b)= a²-b²
4.( a+b+c) = a+b+c+2ab+2ba+2ca
5.(x+a) (x+b) = x²+ax+bx+ab
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