5x2 – 15x – 20.
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To factor
, we first multiply the squared term and the constant term, that is. 
.
Next, we find the factors of
which adds up to the unsquared term. 
and 
are factors of 
and their sum is 
.
Next, we use the found factors to replace the unsquared term (
) and then factor. Thus we have 
Therefore,
.