Come consideri il fattore 2x ^ 3 + 54 #?

First take out the common factor of 2
#2(x^3 +27)#
Then recognize this as the sum of cubes. To factor cubes, memorize the expression #a^3 + b^3 = (a + b)(a^2 – ab + b^2)#
Poi #2x^3 + 54 = 2(x +3)(x^2 -3x +9)#