Question

how this came , pls tell​

Answer 1

Answer:

We know the Formulae:

a² + b² = (a+b)² - 2ab

It's derived from the main formulae

(a+b)² = a² + 2ab + b²

Now, let's put the (+ 2ab) on the left side:

(a+b)² - 2ab = a² + b²

                        -------That's the ANS

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