Question

what is formula of a2+b2
${a}^{2} +{b}^{2}$

Answer 1

Hey !
Here is your answer !!
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(a + b)2 = a2 + b2 + 2ab
a2 + b2 = (a + b )2 - 2ab

OR

(a - b)2 = a2 + b2 - 2ab
a2 + b2 = (a - b)2 + 2ab

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Hope it helps !!

Answer 2

we have
${a }^{2} + {b}^{2} = {(a + b)}^{2} - 2ab$