Asked by Bethany.W

Hello! I am studying for an upcoming math test and I'm trying to figure out how to solve this equation:

Select the expression that is equivalent to (m^2 - 25).
A. (m^2 - 10m + 25)
B. (m^2 + 10m + 25)
C. (m - 5) (m + 5)
D. (m - 5)^2

I do NOT want the answer to this. I just want to know how to solve it, because in the test there will be something similar to it. So if there's any tricks or tips that you have to solve this, please do share!
Answered by a
Try simplifying each of the choices into a variable and a number.
Answered by Bethany.W
Oh wow! That trick actually worked so easily! Thank you! From this, I got the answer was C, then?
Answered by oobleck
yes
and review: the difference between two squares!
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