Question

if ab=3 and ac=7 find bc

Answer 1

in terms of a ?

Answer 2

yes

Answer 3

multiply them:
(ab)(bc)= 3*7 = ?

Answer 4

it has to be in simplest radical form

Answer 5

(ab)(ac)= 3*7 =21
so
a^2bc=21
bc= 21/a^2
or bc = 21a^(-2)