To begin Grouping, you must first find the common factor. The factor you should pull out will be "3r^2". Now you can begin to begin the grouping process. Try to find the common factor of "6r^3" to get "r^2(6r-1)". Then try to find the common factor of "-12r+2" to get "-2(6r-1)". Group "r^2" and "-2" to get "(r^2-2)". Group "6r-1" to get "(6r-1)". Set them equal to zero. Your x-ints are r=0, r=1/6 r= (positive and negative square-root) 2. Make sure to bounce on "0". This is a odd degree. It is positive.
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