Answers

2016-07-20T20:02:11+08:00
Use the Quadratic formula

-b+√b²-4ac
----------------   - Divide
      2a
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2016-07-20T20:03:15+08:00
You can use completing the square. 

6x^2 - 2x - 18 = 0
6x^2 - 2x - 18 = 0   / 6
x^2 - 2/6x - 3 = 0
x^2 - 1/3x = 3
x^2 - 1/3x + 4/9 = 0 + 4/9
(x-2/3)^2 = 4/9
√(x-2/3)^2 = √4/9
x - 2/3 = ±2/3

x - 2/3 = 2/3
x = 2/3 + 2/3
x = 4/3

x - 2/3 = -2/3
x = -2/3 + 2/3
x = 0
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