Question

x^2+ 1/x^2 =79 find x +1/​

Answer 1

Answer:

we know that

$(x +1 \ x) ^2 = x^2 + 1 \x ^ 2 + 2 2x + 1 \x$

given :

$x ^2 + 1 \x ^2 = 79$

$(x + 1 \x)^2 = 79 + 2$

$(x + 1 \x) ^2 = 81$

$(x + 1 \x) = 9$