Question

what should be added to 2x2+y2+5 to get x2+y2

Answer 1

Answer: -5

Step-by-step explanation:

Let z be the added no.

Then A/c question,

                             $2x^{2}+y^{2}+5+z=x^{2}+y^{2}$

                          ⇒$z=x^{2}-x^{2}+y^{2}-y^{2}-5$

                                      = -5

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