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Mathematics 16 Online
OpenStudy (anonymous):

(x+1)(3x-2)-4(x-1)

OpenStudy (anonymous):

Do you know the FOIL method?

OpenStudy (anonymous):

kinda

OpenStudy (anonymous):

First, outer, inner,last

OpenStudy (anonymous):

Correct. So first, multiply (x+1)(3x-2) using the FOIL method. Then tell me what you get

OpenStudy (anonymous):

i got 4x-2x+3x-1?

OpenStudy (anonymous):

Not quite...

OpenStudy (anonymous):

what is x*3x?

OpenStudy (anonymous):

remember, you're multiplying, not adding them

OpenStudy (anonymous):

the same?

OpenStudy (anonymous):

When you multiply x*x, you get x^2

OpenStudy (anonymous):

so when you multiply x*3x, you get 3x^2. does that make sense?

OpenStudy (anonymous):

so its 3x^1?

OpenStudy (anonymous):

It's actually 3x^2

OpenStudy (anonymous):

ok

OpenStudy (anonymous):

so when you multiply (x+1)(3x-2), you should get 3x^2+3x-2x-2. Then you can combine the two middle terms and you end up with 3x^2+x-2

OpenStudy (anonymous):

so that is the first part. Now for the second part. Multiply -4(x+1) and tell me what you get

OpenStudy (anonymous):

-4x-4?

OpenStudy (anonymous):

Sorry I REALLY can't read. you multiplied right, but we need -4(x-1)

OpenStudy (anonymous):

3x^2-3x-6?

OpenStudy (anonymous):

so that would be -4x+4

OpenStudy (anonymous):

and when we add 3x^2+x-2-4x+4, what do we get?

OpenStudy (anonymous):

3x^2-3x+2

OpenStudy (anonymous):

yes, perfect!

OpenStudy (anonymous):

Do you have any other questions?

OpenStudy (anonymous):

no thank you

OpenStudy (anonymous):

Ok, let me know if you do :)

OpenStudy (anonymous):

sure:D

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