Question

Find the zero of the polynomial function

f(x) = x^2 + 11x + 18

Answer 1

Assuming f(x)=0

A method that can be used is so called "Magic Numers" ( My teacher algebra teacher ikes to call it)

First, find two factors that multiply to 18 and add to 11.

9 and 2

Set it in factor form

`(x + 9)(x + 2)`

`(x + 9)(x + 2) = 0`
So this means...


`x + 9 = 0`
Or

`x + 2 = 0`
Solve.


X can either be equal to -9 or -2

Hope this was clear :)