Hey can you me posted picture of question : )

The roots are 3 and -6

Explanation:
The general formula of the quadratic equation is:
ax²+ bx + c = 0
The given equation is:
x² + 3x - 18 = 0
By comparison, we can find that:
a = 1
b = 3
c = -18

To get the roots, we will use the quadratic formula shown in the attached image.

By substituting in the equation, we would find that:
either x = 

or x =  

This means that the roots are: 3 and -6

Hope this helps :)