Mathematics
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OpenStudy (anonymous):
(x+1)(3x-2)-4(x-1)
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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?
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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
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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
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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
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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
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OpenStudy (anonymous):
Ok, let me know if you do :)
OpenStudy (anonymous):
sure:D