Solve for the positive value of c.

9c² - 11 = 718

• 6
• 9
• 11
• 4

Isolate the variable by adding 11 to both sides of the equation right away. You'll be left with:

9c² = 729

Divide both sides by 9.

c² = 81

Take the square root of 81.

c = 9

The question from the test: Mathematical Reasoning GED.