Let's take the equation 8r2 = -2r - 1
Wait! This looks different than our other equations! But, not to worry, it's still a quadratic equation. Let's just rearrange it into this form
(1) 8r2 + 2r = -1
which can be further rearranged to look like this:
(2) 8r2 + 2r + 1 = 0
Now, it doesn't matter if our variable is named r
. It is a variable, and we're solving for it's value.
So let's plug the values for a
, and c
into our quadratic equation solver like so:
Now, click "solve for X," and let's see what happens.