Question: how to solve a quadratic polynomial equation?
Answer: Put the equation in form ax 2 + bx = c. ... 
If a ≠ 1, divide the entire equation by a.
Add the constant value to both sides of the equation.
Write the left side of the equation as a perfect square.
Take the square roots of both sides of the equation, remembering to add the “±” symbol on the right side.