3) y^2 + 2y + 4; y^2 - 2y + 4
a^2 + ab + b^2; a^2 - ab + b^2
25 - 15k + 9k^2; 25 + 15k + 9k^2
4j^2 + 2j + 1; 4j^2 - 2j + 1
4x^2 + 6xy + 9y^2; 4x^2 - 6xy + 9y^2
u^2 + uf + f^2; u^2 - uf + f^2
q^4 + q^2*p^3 + p^6; q^4 - q^2*p^3 + p^6
4s^4 + 8s^2*d^4 + 16d^8; 4s^4 - 8s^2*d^4 + 16d^8
8) (3y - 1)(9y^2 + 3y + 1)
(6s^2 + 8)(36s^4 - 48s^2 + 64)
(m^2 + n)(m^4 - m^2*n + n^2)
(5 - 4w)(25 + 20w + 16w^2)
(xy - 2)(x^2*y^2 + 2xy + 4)
(j*q^2*v + 7)(j^2*q^4*v^2 - 7j*q^2*v + 49)
(3/2*x + 2y)(9/4*x^2 - 3xy + 4y^2)
(9/2 - 1/3*t)(81/4 + 3t/2 + t^2/9)