Simplify and factorise (a+b+c)square-(a-b-c)square +4bsquare-4c square
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(a+b+c)² - (a -b - c)² - 4a² - 4c²
a² + b² + c² + 2ab + 2bc + 2ac - a² - b²- c² + 2ab + 2ac - 2bc + 4b² - 4c²
4b² - 4c² + 4ac + 4bc
4 (b² - c² + ac + bc)
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