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Question 271082: What is 4x squared-x-5? Thank you!
Answer by LarissaRichardson(34)   (Show Source):
You can put this solution on YOUR website! 4x^2-x-5
You need to reverse FOIL
It will be a lot of trial and error since the x variable has a coefficient with it.
you can either start with:
(2x)(2x) which will give you the 4x^2
Or start with:
(4x)(x) which also gives you 4x^2
You will then plug in numbers as like FOIL to figure out what multiplied together and subtracted will give you the correct answers. In this case
(4x-5)(x+1)
F: 4x^2
O: 4x
I: -5x
L: -5
Written: 4x^2+4x-5x-5
Simplified as: 4x^2-x-5
So your answer will be:
(4x-5)(x+1)
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