Question

(ii) x2 + y2 = 40, xy = 12​

Answer 1

Answer:

8

Step-by-step explanation:

${(x + y)}^{2} = {x}^{2} + {y}^{2} + 2xy \\ = > {(x + y)}^{2} = 40 + 2 \times 12 \\ = > {(x + y)}^{2} = 40 + 24 \\ = > {(x + y)}^{2} = 64 \\ = > x + y = \sqrt{64} \\ = > x + y = 8$