Question

a plus b ka whole square ​

Answer 1

Hello !

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

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Answer 2

$(a + b) {}^{2} =( a + b ) \times (a + b) \\ = a(a + b) + b(a + b) \\ = a {}^{2} + ab + ab + b {}^{2} \\ = a { }^{2} + 2ab + b {}^{2} \\ \\ therefore = > (a + b) { }^{2} = a {}^{2} + 2ab + b {}^{2}$