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x2 + x - 1 = 0

Using the quadratic formula this gives us:

x = (-1 + or - (-12 - (4 * 1 * -1))1/2) / 2 * 1

x = (-1 + or - (1 - - 4)1/2) / 2

x = (-1 + or - 51/2) / 2

x = 0.618 and -1.618 (Both given to 3 decimal places only)

Note: x1/2 means the square root of x.

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