4(64 - 125b)
or -4(125b - 64)
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x4+6x3-2x-12 (x3-2)(x+6)
(-2)^4 = -2 x -2 x-2 x-2 = +16 ( a minus times a minus is plus)
That factors to 5(x - 4)(x + 4)(x2 + 16)
x4-49 is the difference of two squares when factored as (x2-7)(x2+7)
The idea is to replace every "x" by "3", and then do the calculations.