Question

x+1/x=5
than
x^2+1/x^2=?

Answer 1

$x + 1 \div x = 5 \\ \\ (x + 1 \div x) ^{2} = 5 {}^{2} \\ \\ x {}^{2} + 1 \div x { }^{2} + 2 = 25 \\ \\ x {}^{2} + 1 \div x {}^{2} = 23$
answer is 23