Question

Simplify (a+b+c)²- (a-b-c)²+4b²- 4c²​

Answer 1

Answer:

(a+b+c)²-(a-b-c)²+4b²-4c²

a²+b²+c²-a²+b²+c²+4b²-4c² :(a²-a²=0)

2b²+2c²+4b²-4c²

6b²-2c².

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