Calculation (2a + B-C) (2a + B + C)

Calculation (2a + B-C) (2a + B + C)

(2a+b-c)(2a+b+c)
=[(2a+b)-c][(2a+b)+c]
=(2a+b)^2-c^2
=4a^2+4ab+b^2-c^2