1)Simplify $\displaystyle \frac{1}{2-11x+12x^2}-\frac{1}{12x^2-5x-2}$

2)Factorise $\displaystyle 49x^2-64(y-x)^2$

For the first question, My attempt is:

$\displaystyle \frac{12x^2-5x-2-2+11x-12x^2}{(2-11x+12x^2)(12x^2-5x-2)}$

$\displaystyle =\frac{6x-4}{(2-11x+12x^2)(12x^2-5x-2)}$

I am confused at deciding on how to start the second question....