Answers

2015-06-28T20:13:05+08:00
The answer could be
  x =(8-√-776)/14=(4-i√ 194 )/7= 0.5714-1.9898i or
 x =(8+√-776)/14=(4+i√ 194 )/7= 0.5714+1.9898i

why?
because 
a=7
b=-8
c=30
If ax2 + bx + c = 0,then x =(8-√-776)/14=(4-i√ 194 )/7= 0.5714-1.9898i or
 x =(8+√-776)/14=(4+i√ 194 )/7= 0.5714+1.9898i

use this formula to see the solution...... x = -b ± b2 - 4ac 2a 

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