Question

Simplify : (5a + 5b – c) (2b – 3c)

Answer 1

(5a + 5b – c) (2b – 3c)

= 5a(2b –  3c) + 5b(2b – 3c) – c(2b – 3c)

= 10ab – 15ac + 10b² – 15ac – 2bc + 3c²

= 10ab + 10b² – 17bc – 15ac + 3c²