Factorise : 2ab2c−2a+3b3c−3b−4b2c2+4c
2ab2c−2a+3b3c−3b−4b2c2+4c=2a(b2c−1)+3b(b2c−1)−4c(b2c−1)=(b2c−1)(2a+3b−4c)
Factorise: 4a2−9b2−2a−3b