30x^2-11x-6 describe using the box method

STEP 1 : Find 2 numbers which -
Add to give - 11
Multiply to give - 180 (because 30*-6)

So the 2 numbers are:
9 and - 20

STEP 2 : Input these numbers into the equation -

(remember to add the x next to 9 and - 20)

STEP 3 : Split them into 2 brackets -
Factorise them out to give -

The numbers inside the brackets MUST ALWAYS BE THE SAME

STEP 4 : This is the easiest step... You just have to end up with 2 brackets -

Is from the outside of both the brackets

Is from the bracket which must ALWAYS be the same

So you end up with your

It’s hard to understand what you put.. can you show a picture ?