How do you use the quadratic formula and solve 0=10x^2 + 9x-1?

May 12, 2015

A quadratic equation is written in the form:
$a {x}^{2} + b x + c = 0$

The given equation $10 {x}^{2} + 9 x - 1 = 0$

Where:
$a = 10$
$b = 9$
$c = - 1$

The quadratic formula can be used to find the roots of any quadratic equation.

$x = \frac{- b \pm \sqrt{{b}^{2} - 4 a c}}{2 a}$

So I encourage you to plug in the values from this equation and simplify.

The answers should be x = −1 and x= 1/10