Question

How do you find the GCF of `12ab, 18b`?

Answer 1

`GCF(12ab,18b)=color(red)(6b)`

Explanation:

`{: ("Prime factors of "12ab,color(white)("XX"),2,2,3,,a,b), ("Prime factors of "18b,,ul(2),ul(color(white)2),ul(3),ul(3),ul(color(white)a),ul(b)), ("Common prime factors",,color(red)2,color(white)(2),color(red)3,,,color(red)b) :}`

`GCF ("Greatest Common Factor") = "product of common prime factors"`

`color(white)("XXX")=color(red)2xxcolor(red)3xxcolor(red)b`

`color(white)("XXX")=color(red)(6b)`