Answer: −2 < x < 2.
- A −2 < x < 2
- B only x < 2
- C only x > 2
- D x < −2 or x > 2
Correct answer: A. −2 < x < 2
Explanation: x² < 4 means |x| < 2, i.e. −2 < x < 2.
One-variable inequalities use open (excluded) or closed (included) circles on a number line; two-variable inequalities use a dashed (strict) or solid (non-strict) boundary line, with the solution being the entire shaded half-plane on one side of it.
Concept context
Solving linear inequalities in one and two variables algebraically and graphically, and representing solutions on a number line or as a region in a plane.