Question

A plus B the whole square is

Answer 1

Answer:

Asquare plus Bsquare plus 2ab

Step-by-step explanation:

we are learning this formula from second class so I think u don't need explaination

Answer 2

Answer:

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

Step-by-step explanation:

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

$= (a + b)(a + b)$

$= a(a + b) + b(a + b)$

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

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