Solve the Equation $\log _ { 21 } ( x + 84 ) = 3 - \log _ { 21 } x$

question 409

Multiple Choice

Solve the equation.
- $\log _ { 21 } ( x + 84 ) = 3 - \log _ { 21 } x$

• A) \(\{ 63 \}\)
• B) \(\{ 147 \}\)
• C) \(\{ - 147 \}\)
• D) \(\{ - 63 \}\)

---

Definitions:

DSM-5

The fifth edition of the Diagnostic and Statistical Manual of Mental Disorders, a comprehensive classification of mental health conditions published by the American Psychiatric Association.

Restricting Type

A subtype of anorexia nervosa characterized by severe limitation of calorie intake without engaging in binge-eating or purging behavior.

Excessive Exercise

Physical activity that is beyond what is considered healthy or normally recommended, often leading to physical and psychological complications.

Body Dysmorphic

A mental disorder characterized by obsessive thinking about a perceived flaw in one's physical appearance.