1) \frac{3x^{2}+7x-6}{4-9x^{2}}

[latex]\frac{3x^2+7x-6}{4-9x^{2}}= \frac{3(x+3)(x-\frac{2}{3})}{(2-3x)(2+3x)}=\frac{(x+3)(3x-2)}{(2-3x)(2+3x)}=-\frac{(x+3)(2-3x)}{(2-3x)(2+3x)}=-\frac{x+3}{2+3x}[/latex] ..........................................................................................................