Question

if x+1/x=4 then find x-1/x

Answer 1

Hi friend here is your answer

$x + 1 \div x = 4 \\ squaring \: both \: sides \\ (x - 1 \div x)^{2} + 4x \times 1 \div x = 16 \\ (x - 1 \div x)^{2} + 4 = 16 \\ (x - 1 \div x)^{2} = 12 \\ (x - 1 \div x) = \sqrt{12}$
Hope it helps you.

Answer 2

Here is your answer... check it