Set Up an Equation and Solve the Problem

question 194

Short Answer

Set up an equation and solve the problem. 81 less than the square of a number equals zero. Find the number. Please enter your answer as two numbers, separated by a comma.

---

Definitions:

Ganglionic Layer

A layer of the retina that contains the cell bodies of ganglion cells and is a critical part of the visual pathway.

Choroid Layer

A layer of the eye between the retina and the sclera that contains blood vessels and provides oxygen and nutrients to the eye.

Pigment Cell Layer

A layer of cells that contain pigment, such as the melanin-containing cells found in the skin or the iris of the eye, which provide coloration and protection from UV light.

Tympanic Membrane

Also known as the eardrum, a thin membrane that vibrates in response to sound waves, transmitting sounds to the middle and inner ear.