Ok guys...this college algebra stuff is kicking my butt! Here is the problem. I'll show it step by step of how my book has it:
1) 27t^3 - 64 =0
2) (3x)^3 - (4) ^3
3) (3x-4) (9x + 12x + 16) = 0
After that, the solve for the 3x-4, and the 9x+12x+16 (the latter is a quadratic equation using the quadratic formula). I totally understand how to work both of those, however what I'm stuck on is how they get from step 2 to step 3... I have a feeling once someone says it, I'm going to be like "duh" Can someone help me get to the "duh" point??

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1st one is a difference of 2 cubes

(3t-4)(9t^2+12t+16)

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