Question

(ab − 7ac)(3ab + 2abc) =

Answer 1

(ab − 7ac) (3ab + 2abc) =

(a × (b - 7c)) + (ab × (7 + 2c))

(a × (b - 7c) + ab × (3 + 2c)

a × (b - 7c + b × (3 + 2c))

a × (b - 7c + 3b + 2bc)

= a × (4b - 7c + 2bc)