Question

(a+b+c) (a+b-c) please help me out ​

Answer 1

a²+b²+c²

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Answer 2

Answer:

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Step-by-step explanation:

Let us consider a + b as z

(z + c)(z - c)

(a + b)(a - b) = a² - b²

Therefore (z + c)(z - c) = z² - c²

(a + b)² - c²

(a + b)² = a² + b² + 2ab

a² + b² + 2ab - c²