What if my equation doesn't factorise?

For all quadratic equations, you can use the quadratic formula. Given an equation of the form ax²+bx+c, you can plug those values into this formula:x₁, x₂ = (-b +/- sqrt(b² - 4ac)) / 2aNote: the term b² - 4ac is called the determinant  and must be greater than 0 for your equation to have any solutions.