SOLUTION: how do I factor completely and know that is prime or not 25a^2-23a-2

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Question 699580: how do I factor completely and know that is prime or not
25a^2-23a-2
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

25a%5E2-23a-2....replace -23a with 2a-23a
25a%5E2%2B2a-25a-2...group
%2825a%5E2%2B2a%29-%2825a%2B2%29
a%2825a%2B2%29-%2825a%2B2%29
%28a-1%29%2825a%2B2%29