Use the quadratic formula to find the roots of y = 2x² + 4x + 1.

How about we check if you know your abc's?

a = 2
b = 4
c = 1

Aw yeah. Next, we plug our numbers into the quadratic formula.

Clean it up and simplify.

Use the quadratic formula to find the roots of y = x² – 16.

This is a quadratic function, so we can still use the quadratic formula.

a = 1
b = 0
c = -16

We just have b = 0. Everything works out the same otherwise.

And done.

Use the quadratic formula to find the roots of y = x² + 4x + 4.

a = 1
b = 4
c = 4

Third verse, same as the first.

There is only one real root for this equation.

Use the quadratic formula to find the roots of .

b = 3
c = 6

The denominator is just 1, so let's kick it to the curb.

x = -3 ± √(9 – 12)
x = -3 ± √(-3)
x = -3 + i √3 and x = -3 – i √3

In this case, we've got two complex roots.