Jawabanmu

2014-08-23T09:04:23+07:00
A.  x^{2} - 9x + 8x - 72 =  x^{2} - x - 72
b. 
Eh, yg B kelewatan :D
b. 110x2 - 40x - 77x + 28 = 110x2 - 117x + 28