When sketching ( y = |x| ), ( y = x^2 ), or ( y = \sqrt4 - x^2 ), most solutions include correct shape, intercepts, and symmetry notes.

This plot visualizes the first exercise in Section 1.1, highlighting why the domain is all real numbers while the range is restricted to values ≥1is greater than or equal to 1

: Determining the valid inputs and resulting outputs for various functions, including square roots and rational expressions.

✅ , if: