Question

meaning of this property

Answer 1

here your answer dear..

(a+b) (a-b)= a sq- b sq

Answer 2

First, take (a+b). then , square it :

$(a + b) {}^{2} = aa + ab + ba + bb \\ \\ = {a}^{2} + 2ab + {b}^{2}$

subtract 2ab from both sides , you have

${a}^{2} + 2ab + {b}^{2} - 2ab = (a + b) {}^{2} - 2ab$

${a}^{2} + {b}^{2} = (a + b) {}^{2} - 2ab$

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