Question

Simplify : (a+b+c) (a+b-c)​

Answer 1

Step-by-step explanation:

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

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

2a +2b+2c

Answer 2

Answer:

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

Step-by-step explanation:

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

$⇒a^{2}+ab-ac+ab+b^{2}-bc+ac+bc-c^{2}$

$⇒a^{2}+b^{2}+c^{2}+ab+ab-ac+ac-bc+bc$

$ab  and   bc  are  cancelled  by  -ab  and   -bc$

$<u>a^{2}+b^{2}-c^{2}+2ab$

Hope it helps!

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