Question

If x2+y2=9and xy=8,then x + y is equal to

Answer 1

Answer:

Heyy mate hope it helps u..

Step-by-step explanation:

Given, $x^{2} +y^{2} =9$

$xy=8$

To find $x+y=?$

Using first identity we get,

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

We know the values of $x^{2} +y^{2}$ and $xy$

$(x+y)^{2} = 9 + 2(8)$ [ substituting the values in the identity]

$(x+y)^{2} = 9 + 16$

$(x+y)^{2} = 25$

$(x+y) = \sqrt{25}$

$(x+y)= 5$

All done plz mark me as a brainliest