Question

Do the following sums.
21) Ifx = 2 + V2 and y = 2 - V2, then find the value of x2 + y2?​

Answer 1

Answer:

(2+√2)^2 + (2-√2)^2

2×2 +2×2×√2 + √2×√2 + 2×2-2×2×√2+√2×√2

4+4√2+4 + 4+-4√2+4

8+4√2 + 8-4√2

16. Ans