x^2-3=-4
Let's solve in ℝ: x2 -3 = -4
ⓘ We add 3 to both sides
x2 = -4 + 3
ⓘ Start from -4 and move forward 3 on the number line, getting closer to zero: -4 + 3 = -1
x2 = -1
In ℝ, a square is never negative: no real number has -1 as its square
▶Solution: x ∈ ∅