Before you use the quadratic formula, you have to make sure the equation itself is a quadratic and that a and b are not 0.
Answer:
9.209
Step-by-step explanation:
On the thousandths place, 9 is bigger than 2.
The decimal is irrational because it is not repeating.
Now, assuming is a vertical parabola, so the squared variable is the "x", let's do some checking.