To factorise this completely you need to be aware that 216 = 63.
(x3 + 216) = (x + 6)(x2 - 6x + 36)
1x to the power of 4
6x^2(2x + 5)
5x^3(3x + 2)
3x3 + 192 3(x3 + 64) ========
(x + 1)(x^2 - x + 1)
2x3+2x2-12x take out GCF - 2x 2x(x2+x-6) factor - find factors of -6 that add up to 1 2x(x-2)(x+3)
7x(3x3 - 2x2 + 5x + 1)
12n2 plus 8n?
6(x + 9)(x - 1)
128
91
(x^2 - 3x + 5)(x^2 + 3x + 5)