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

##### 1 Answer

#### Answer:

I will show you how and let you do the calculations

#### Explanation:

First you need to know the standard form which is:

In your case set:

These are then substituted into:

If the curve crosses the line in two places you will have two answers. If it is such that the x-axis is tangential to the curve then you only have one solution. If the curve is such that it does not cross the x-axis then (I think!)

In your case you will have:

Notice that I use brackets to make sure that the positive or negative state of the values can be included. Reduces confusion!!!

Now you have a go at doing the calculation!!!