i-want-to-know-how-2-2-2-2-why-not-2-2-2-2-

Question Number 36080 by Rio Mike last updated on 28/May/18

i want to know how

α^{2} + β^{2} = {(α + β)}^{2} - 2 α β why not

α^{2} + β^{2} = {(α + β)}^{2} + 2 α β ?

Commented by Joel579 last updated on 29/May/18

α^{2} + β^{2} = {(α + β)}^{2} - 2 α β

= {(α - β)}^{2} + 2 α β

Answered by tanmay.chaudhury50@gmail.com last updated on 28/May/18

v a l u e o f {(α + β)}^{2} - 2 α β

= α^{2} + 2 α β + β^{2} - 2 α β

= α^{2} + β^{2}

v a l u e o f {(α + β)}^{2} + 2 α β

= α^{2} + 2 α β + β^{2} + 2 α β

= α^{2} + β^{2} + 4 α β

t h a t i s w h y \dots

Answered by Rasheed.Sindhi last updated on 28/May/18

α^{2} + β^{2}

= α^{2} + 2 α β + β^{2} - 2 α β

= {(α + β)}^{2} - 2 α β