How do you simplify #\frac { 2x } { x ^ { 2} + 8x - 9} \div ( \frac { x ^ { 2} + 4x } { x ^ { 2} - 81} \cdot \frac { x - 9} { x + 4} )#?
1 Answer
Oct 5, 2017
Explanation:
This question is best done by factorising expressions wherever you can, and then going on from there.
Following BODMAS, we work with what's in the brackets first.
We can change this division sign into a multiplication sign by flipping the fraction on the right.
So,