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qwelly [4]
4 years ago
13

X^{2} +y^{2} =?cho mình hỏi với

Mathematics
1 answer:
solong [7]4 years ago
8 0

Answer:

{ \sf{ {x}^{2}  +  {y}^{2} =  {(x + y)}^{2}  - 2xy }}

Step-by-step explanation:

{ \tt{ {(x + y)}^{2} = (x + y)(x + y) }} \\ { \tt{ {(x + y)}^{2} = ( {x}^{2} + 2xy +  {y}^{2})   }} \\ { \tt{( {x}^{2} +  {y}^{2} ) =  {(x + y)}^{2}   - 2xy}}

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