Look for a factor common to all terms.
Here, there is no common factor.
Find two numbers whose product is 3.
Now find two numbers whose product is 1.
Find the possible factorizations.
The last term of the trinomial is positive.
So, the signs of the second terms must be the same.
The possible factorizations are:
The outside product plus the inside product must equal –4
– 1) gives a middle term of –4
+ 1 = (
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