give formulae about alzebra

There are many formulae in algebra, some of them are following : {(a + b)}^{2} = a^{2} + 2 a b + b^{2} {(a - b)}^{2} = a^{2} - 2 a b + b^{2} a^{2} - b^{2} = (a + b) (a - b) (x - a) (x - b) = x^{2} - (a + b) x + a b (x + a) (x + b) = x^{2} + (a + b) x + a b

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