Jawabanmu

2014-08-12T19:24:58+07:00
2014-08-12T19:28:10+07:00
1. (5y" - 8y) (5y + 8y)
     5y" - 8y + 5y + 8y
     5y" - 8y + 8y + 5y
     5y" - 5y

2. (x - 3) (x" - 2x + 5)
    x - 3 + x" - 2x + 5
    x - 2x -3 + 5 + x"
    -x + 2 + x"