English | Español

Try our Free Online Math Solver!

Online Math Solver












Please use this form if you would like
to have this math solver on your website,
free of charge.

The Quadratic Formula

There is a nice formula for finding the roots (zeroes, ”where the graph crosses
the x-axis”). The idea is that given a quadratic polynomial :

We can say the roots occur at:

We could plug this back into our equation and see that we do indeed get zero ,
but for now, I will ask you to just believe me.


Find the roots of the polynomial y = 2x2 − 6x + 4.
To do this, we see we can simply apply the given formula to get:

We notice that plugging in the values of x = 2 and x = 1 do indeed give us zero,
this makes us happy.

Prev Next