Question Use the square roots property to solve the quadratic equation \( u^{2}-270=-266 \). If there are multiple answers, list them separated by a comma, e.g. 1,2 . If there is no real solution, enter \( \varnothing \).

First, we can rewrite the equation \( u^{2}-270=-266 \) as \( u^{2}=270-266 \), which simplifies to \( u^{2}=4 \). Now, applying the square roots property gives us \( u = \sqrt{4} \) or \( u = -\sqrt{4} \). Thus, the solutions are \( u = 2 \) and \( u = -2 \). The answers are: 2, -2.