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

question 187

Multiple Choice

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

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

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Definitions:

Tension-Cohesion Model

A model explaining the movement of water through plants, based on water molecule cohesion and tension within xylem vessels, enabling water transport from roots to leaves.

Water Potential

A measure of the potential energy in water, driving the movement of water through plant tissues and determining the direction of its flow.

Cohesion

The action or property of like molecules sticking together, being mutually attractive, which is observed in various physical phenomena such as water droplets forming on a surface.

Water Molecules

The smallest unit of water, consisting of two hydrogen atoms bonded to one oxygen atom, essential for life's processes.