Make bottom number same
ok, so remember
(a-b)(a+b)=a²+b²
so
to get from (y-x) to (y²-x²), multiply 2nd fraction by (y+x)
so multiply 2nd fraction by (y+x)/(y+x)

=

=
The answer to your question would be 0.01
The factored form would be (3x-9)(x-1)
The picture should help a bit
It would come out to be $41.8275, so if you round it would cost $41.83.