Use the quadratic formula to find the solutions.

Substitute the values , , and into the quadratic formula and solve for .

Simplify the numerator.

Raise to the power of .

Multiply by .

Multiply by .

Subtract from .

Any root of is .

Multiply by .

The final answer is the combination of both solutions.

Solve Using the Quadratic Formula x^2+9x+20=0