Answers

2014-10-22T23:19:00+08:00
X²+5x-14= 0
x=[-5+or- √5²- (4 . 1 .-14)]/2 .1
x= ( -5 + or-√ 25 + 56)/2
x=(- 5 + or- √81 )/2
 x=(-5+9)/2    = 2
x= (-5-9)/2
  x = -7
so    x = 2 or - 7
note: actually to solve this equation,it is
easier to factorize it
 (x+7)(x-2) = 0

 
 
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