Question

(a-b)2
$(a - b)^{2}$
full formula​

Answer 1

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

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

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

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

therefore,

${ \color{red}\bold{ {(a - b)}^{2} }}= B) \: \color{blue}\bold{ {a}^{2} - 2ab + {b}^{2} }$

is the answer