Question

if X equals to 7+5√2, then (x^2+1/x^2) = ?​

Answer 1

Answer:

X = 7+5√2

(x^2 + 1/x^2)

x^2 = (7 + 5√2) ^2 = 49 + 70√2 + 50 = 99 + 70√2

99+ 70√2+ 1/99+70√2 = 100+70√2/99 + 70√2

10(10 + 7√2) /99 + 70√2

199,99 ( √2 = 1,41)