Solve $x^2 \lt 20\text{.}$ Answer: You may use inequality symbols or enter your answer using interval notation. When using inequality symbols, enter “<=” for $\le\text{,}$ and enter “>=” for $\ge\text{.}$ When using interval notation, use “inf” for $\infty$ and use “U” (an upper case letter u) for the union symbol $\cup\text{.}$