SOLUTION: How do I factor by grouping? 7x^3-28x^2-3x+12 I started by (7x^3-28x^2)+(-3x+12) after I did this 7x(x^2-4x)+-3(x+-4) Answer (7x-3)(x-4) This is not right I don't think I

Question 132288: How do I factor by grouping?
7x^3-28x^2-3x+12
I started by
(7x^3-28x^2)+(-3x+12)
after I did this
7x(x^2-4x)+-3(x+-4)
Answer
(7x-3)(x-4)
This is not right I don't think I need help! I am not getting it.
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

Start with the given expression

Group like terms

Factor out the GCF out of the first group. Factor out the GCF out of the second group

Since we have the common term , we can combine like terms

So factors to

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