Jawabanmu

2014-09-04T19:58:38+07:00
A. 3x² - 3x - 2x + 2
    3x² - 5x + 2
b. ( 5x + 7 ) ( 5x + 7 ) 
      25x² + 35x + 35x + 49 
      25x² + 70x + 49 
c. 9x² - 8x + 7x - 7
    9x² - x - 7
2014-09-04T20:03:22+07:00
A. (3x-2)(x-1)
= 3x²-5x+2
b. (5x+7)²
= (5x+7)(5x+7)
= 25x²+70x+49
c. (8x+7)(x-1)
=8x²-x-7