Answers

2014-10-12T20:06:50+08:00
 ax²+b+c=0
ax (exponent of 2) plus b plus c equals zero
x²-x-196=0
x²-x-196=(x-14)(x+14)

setting each linear factor to zero, we get:
x-14=0          x+14=0
x=14              x= -14
0
2014-10-12T20:51:26+08:00