Question

(a+b-c)² formula

can you find​

Answer 1

Answer:

hope it will help you

Step-by-step explanation:

(a+b+c)²=a²+b²+c²+ab+bc+ca

Answer 2

$\mapsto \rm \: {(a + b - c)}^{2}$

as u can see , C has a negative sign ,so , just put c = -c in the Formula of (a+b+C)²

$\boxed{ {(a + b + c)}^{2} = {a}^{2} + {b}^{2} + {c}^{2} + 2(ab + bc + ac}$

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

$\implies \: {a}^{2} + {b}^{2} + {c}^{2} + 2(ab - bc - ac)$