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Use the quadratic formula...
[-b +/- sqrt(b^2 - 4ac)] / 2a
You use this formula when you have a quadratic equation ( ax^2 + bx + c).
In this case: a=2, b= -7, c= -86.
Plug into the formula...
[7 +/- sqrt(7^2 - 4(2)(-86))] / 2(2)
= [7 +/- sqrt (737)] / 4
Equating this you get x = 8.537 and x = -5.037
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