Science and Mathematics for Engineering 6th Edition by John Bird

Exercise 8

Factorise: (a) $2 x ^ { 2 } y ^ { 3 } - 10 x y ^ { 2 }$
(b) $21 a b ^ { 2 } c ^ { 3 } - 7 a ^ { 2 } b c ^ { 2 } + 28 a ^ { 3 } b c ^ { 4 }$