Question

a^2-2a-1=0 find a^2 + 1/a​

Answer 1

Answer:

a^2-2a-1=0

a=

$x = 1 + \sqrt{2 } \\ a ^{2} + 1 \div a \\ ( 1 + \sqrt{2}) ^{2} + 1 \div (1 + \sqrt{2}) \\ = 7 + \5 \sqrt{2}$