how do you factor polynomial? such as 3x2 + 2x -18x -12?
1. Rewrite and rearrange the question:
$\displaystyle Let y(x)= 3x^2 - 18x + 2x - 12$
$\displaystyle y(x) = 3x^2 - 16x - 12$
2. Use Synthetic Division method;
Let $\displaystyle x$ at any value (try n error) until you manage to get $\displaystyle y(x)= 0$
in that case, if $\displaystyle x = 6$;
$\displaystyle
y(6) = 3(6)^2 - 16(6) -12$
$\displaystyle y(6) = 0$
So $\displaystyle (y-6)$ is one of the factor, and synthetic division method can start be applied
did u know how to use that method?