The GCF is 3.
The GCF is 3y2
3y4 + 3y2 = 3y2(y2 + 1)
The GCF is 2.
(5y - 6z)(2y + z)
3(y + 4)(y + 2)
All six of them
=(3x) * (x^3+4x^2+9)
Since 3y^2 is a factor of 18y^2, it is automatically the GCF.
56
(2x2 + 3y2)(4x4 - 6x2y2 + 9y4)
(3y - 2)(y - 4)
(y - 1)(3y + 7)