Question

formula of (a-b) whole sqare​

Answer 1

Answer:

the formula for

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

is

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

you just have to write it two times and multiple it

Answer 2

Answer:

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

Step-by-step explanation:

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

Hope it helps you.