Question

If x² + y² =9 and xy = 8 then what is x + y equal to?​

Answer 1

Answer:

I guess 4.5 .

hope it is helpful to you

Answer 2

Question :-

• If x² + y² =9 and xy = 8 then what is x + y equal to?

Solution :-

We know that

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

Hence,

$(x + y) {}^{2} = 9 + 2 \times 8 \\ \\ (x + y) {}^{2} = 9 + 16 \\ \\ (x + y) {}^{2} = 25 \\ \\ (x + y) = \sqrt{25} \\ \\ (x + y) = 5 \: \: \: ans$