SOLUTION: factor completely: 3r^2-75

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Question 225238: factor completely:
3r^2-75

Answer by chibisan(131)   (Show Source): You can put this solution on YOUR website!
factor completely :
3r^2-75
3(r^2-25)
Note: (a-b)(a+b) = a^2 - b^2
3(r^2-5^2)
3(r+5)(r-5) (factorised)

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