Jawabanmu

2014-08-15T18:12:49+07:00
1.  \frac{ x^{2} - 16}{ x^{2}  + 8x + 4}
   =  \frac{(x+4) (x-4)}{}
nomor 1 ga nemu. mentok.

2.  \frac{2 x^{2}  - 3x - 9}{4 x^{2} - 9}
   =  \frac{(x-3) (2x+3)}{(2x+3) (2x+3)}
   =  \frac{x-3}{2x-3}

3.  \frac{ x^{2}  y^{2} -  z^{2}  }{xy+z}
   = xy-z

4.  \frac{ x^{2} + 4x - 12}{2 x^{2} + 9 - 18}
   =  \frac{(x-2) (x+6)}{(2x-3) (x+6)}
   =  \frac{x-2}{2x-3}