Question

Expand (a+b-2c)^2 it's urgent

Answer 1

Answer:

(a+b-2c)(a+b-2c)

=a(a+b-2c)+b(a+b-2c)-2c(a+b-2c)

=a^2+ab-2ac+ab+b^2-2bc-2ca-2bc+4c^2

=a^2+b^2+4c^2+2ab-4ac-4bc

Here's the answer

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