Subtract from both sides of the equation.

Add to both sides of the equation.

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 .

Rewrite as .

Pull terms out from under the radical, assuming positive real numbers.

Multiply by .

Simplify .

Divide by .

The final answer is the combination of both solutions.

Double roots

Solve Using the Quadratic Formula x^2=18x-81