p2 - 25 = (p - 5)(p + 5)
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Factor: 9x2 - 25.
First you have to solve the subtraction and in the next step you will factor it out.
Find a number that evenly divides each term of the expression.
It is: 5 that is a prime factor of 25
The greatest common factor of 25 and 175 is 25.