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you're close :)
take a look here:
|dw:1436245778372:dw|

Thank you very much, you've been very helpful

you're welcome ^_^!

https://people.richland.edu/james/misc/acmeth.html

Why did u multiply by -1?

to show you that there are different ways of making use of methods that you can come up with.

let see what wolframalpha can tell us

try the AC method I showed you.

this is a test of your arithmetic abilities mostly.

because one is negative, guy

you can't escape the negative

oh alright now I get it. Thanks for your help,sir. i appreciate it

Ac method is similar to factoring by grouping

perhaps... perhaps

it will depend on the problem you are given

one last question:
-9x^2+9x so the GCF of this binomial is -9x
-9x(x-1)

that would be correct :)