Question

Fully factorise 15ab - 35a

Answer 1

The answer is 5a (3b-7).
Step 1: find the common factor. since both 15ab and 35a has a common "a" and a factor of "5", you factorise them out.
Step 2: place the common factor at the front and divide the equation from the common factor.
5a (3b-7) = 15ab - 35a