Jawabanmu

2014-08-19T18:09:14+07:00
4. 3x^2 + 12x - 15
5. 10x^2 -41x + 21
Jawaban paling cerdas!
2014-08-19T18:11:54+07:00
4. ( x + 5 ) ( 3x - 3 )
(x).(3x) + (x).(-3) + (5).(3x) + (5).(-3) = 3x² - 3x + 15x - 15 = 3x² + 12x - 15
5. ( 2x - 7 ) ( 5x - 3 )
(2x).(5x) + (2x).(-3) + (-7).(5x) + (-7).(-3) = 10x² - 6x - 35x + 21 = 10x² - 41x + 21