Question

prove that x sqr +y sqr =(x+y)sqr -2ab​

Answer 1

Answer:

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Step-by-step explanation:

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