Question

$6a(a-3) = (a+1 )^3 - (a-1 )^3$

Answer 1

se trata de productos notables:

6a(a - 3) = (a + 1)^3 - (a - 1)^3
6a^2 - 18a = (a^3 + 3a^2 + 3a + 1) - (a^3 - 3a^2 + 3a -1)
6a^2 - 18a = a^3 + 3a^2 + 3a + 1 - a^3 + 3a^2 - 3a +1
6a^2 - 18a = 6a^2 + 2
-18a = 2
a = -2/18 = -1/9

Answer 2

nomas  resuelve el exponente y te saldra