Question

Simplify (a + b + c)(a + b - c)​

Answer 1

$\huge\rm{\boxed{\red{ ◆Solution◆ }}}$

=> (a + b + c)(a + b - c)

=> a (a + b - c) + b (a + b - c) + c (a + b - c)

=> a² + ab - ac + ab + b² - bc + ac + bc - c²

$\boxed{ => a² + b² - c² + 2ab }$

Hence, shown.

Answer 2

Answer:-

a²+b²-c²+2ab

Step-by-step explanation:-

$(a + b + c)(a + b + c)$

=a²+ab-ac+ab+b²-bc+ac+bc-

= a²+b²+c²+ab+ab-ac+ac-bc

²

$\fcolorbox{black}{white}{a² + b² - c² + 2ab}$