# How do you find the roots, real and imaginary, of #y=(x/5-5)(-x/2-2)# using the quadratic formula?

##### 1 Answer

#### Answer:

#### Explanation:

Note that by definition, the roots equal 0. So we can set

Let's multiply this by -1 to simply things.

Funnily, you can quite easily factorize this polynomial: by factoring x and -25. However, you need to use the formula, which complicates things.

Substitute