Question

Prove that :
(a+b+c)(a-b+c)= (a^2) + (b^2) + (c^2)​

Answer 1

Step-by-step explanation:

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

=a^2-ab+ca-ba+b^2+bc-ca+cb+c^2

=a^2+b^2+c^2

Can be written as:

(a^2)+(b^2)+(c^2)

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