Jawabanmu

2014-02-26T21:51:02+07:00
1) x1 - x2   = √D / a

2) x1² + x2² = (x1 + x2)² - 2x1.x2

3) x1² - x2²  = (x1 + x2) (x1 - x2)

4) a/x1 + a/x2 = a (x1 + x2)/x1.x2


- x1.x2 = c/a
- x1-x2 = √D/a --> (b²-4ac)/a
- x1+x2 = -b/a