Question

$(a - b - c) ^{2} - (a - b - c) ^{2} - 4b ^{2} + 4c ^{2}$
simplify and factorise

Answer 1

Answer:

(a-b-c)²-(a-b-c)²-4b²+4c²

0-4b²+4c²

4c²-4b²

(2c)²-(2b)²

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

2(c+b)(c-b)

Answer 2

a^2 - b^2 - c^2 - a^2 + b^2 + c^2 - 4b^2 + 4c^2


a^2 - a^2 = 0
b^2 - b^2 = 0
c^2 - c^2 = 0

- 4b^2 + 4c^2

4(c^2 - b^2)ans..