12а^4 + 18a^2 = 6a^2(2a^2 + 3)
2x^3 - 5x^2 - 6x + 15 = (x - 3)(2x^2 + x - 5)
9a^2 - 4b^2 = (3a + 2b)(3a - 2b)
3a^3 - 48ac^2 = 3a(a^2 - 16c^2) = 3a(a - 4c)(a + 4c)
12а^4 + 18a^2 = 6a^2(2a^2 + 3)
2x^3 - 5x^2 - 6x + 15 = (x - 3)(2x^2 + x - 5)
9a^2 - 4b^2 = (3a + 2b)(3a - 2b)
3a^3 - 48ac^2 = 3a(a^2 - 16c^2) = 3a(a - 4c)(a + 4c)