Jawabanmu

2014-09-05T20:33:40+07:00
A=15, b=10 dan c=-4

x12=(-b+/-√(b²-4.a.c))/(2.a)

x12=(-10+/-√(100-4.15.(-4)))/(2.15)

x12=(-10+/-(√340))/(30)

x12=-1/3 +/- 4/30√85

X1=-1/3+4/30√85

x2=-1/3-4/30√85