Solve the Inequality $$x ^ { 2 } - 4 x - 21 \leq 0$$

question 82

Multiple Choice

Solve the inequality. Write the solution set in interval notation.
- $$x ^ { 2 } - 4 x - 21 \leq 0$$

• A) \(( - \infty , - 3 ] \cup [ 7 , \infty )\)
• B) \([ 7 , \infty )\)
• C) \(( - \infty , - 3 ]\)
• D) \([ - 3,7 ]\)

---

Definitions:

Color-Sensitive Receptors

Specialized cells in the eye (such as cones) that respond to different wavelengths of light, enabling color vision.

Cones

Photoreceptor cells in the retina of the eye that function best in relatively bright light and enable the perception of color.

Distinguish

To recognize or point out the differences between two or more things or people.

Eye-Tracking Headgear

A device used to measure where and how movement of the eyes occurs, often used in psychological and neuromarketing research.