Verified answer

3x^2(x + 6)(x - 6) - 36

= 3(x^4 - 36x^2 - 12)

Do you know how to expand (x+6)(x-6)?

If so, do that. Then multiply it by 3x^2. Then subtract 36.

From there, try to find common factors. Then, see if there are any rational roots and divide (if you don't know what I'm talking about, ignore).

(x+6)(x-6)

= x^2-36

=3x^2(x^2-36)-36

=3x^4-108x^2-36

=3(x^4-36x^2-12)

i think- try and simplify even further if u can