# How do you find all the zeros of #f(x) = x^4 – x^3 + 7x^2 – 9x – 18#?

##### 1 Answer

May 30, 2016

#### Answer:

#### Explanation:

The constant coefficient divided by the maximum power coefficient in a polynomial, gives the product of all its roots.

So

Supposing integer roots and testing for

we obtain:

then we can do

Now dividing

so all the roots are