Solve for x - x2-9x plus 14 equals 0?

x - x2 - 9x + 14 = 0 ; whence,

x2 + 8x = 14 ,

x2 + 8x + 16 = 30 , and

x + 4 = ±√30 .

Therefore,

x = ±√30 - 4 .