Use the quadratic equation. It gives
x = (1 - sqrt(5))/2 = -0.6180 (approx)
and
x = (1 + sqrt(5))/2 = 1.6180 (approx).
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That factors to (a + 1)(a + b) a = -1, -b b = -a
2sinx+1 equals 0
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x2-2x+1 = 0 (x-1)(x-1) = 0 x = 1 and also x = 1
x squared -2x-3 equals 0 is the same as (x + 1)(x - 3) = 0