Posted by Jessica on Tuesday, July 21, 2009 at 10:45pm.
Start by factoring out the GCF, which in this case is 3.
So you get
3m²-75
=3(m²-25)
The part in parentheses is the difference of two squares. Look up your course notes to see how to factor this part, namely using the standard form:
(A²-B²) = (A+B)(A-B)
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