First find the square root of -24 which would be -4.898979486 then either subtract 1 or add negative 1, it's the same thing, and that would give you -5.898979486.
So, the +/- means there are two answers, one that adds the √(-24) and one that subtracts the √(-24). You can leave that the way it is as +/- The negative inside the square root is an imaginary number "i" = √(-1) This is whats called a complex number which has the imaginary number "i". Factor out the imaginary number and any perfect square factors of 24. 24 = 6 × 4 4 is a perfect square of 2, so 2 factors out of the square root.
