"y = 2x2 - 12x + 6" is a quadratic equation which describes a parabola whose vertex occurs at the point (3, -12) and which has a range of -12 → ∞. It intercepts the x-axis at the points (3 - √6, 0) and (3 + √6, 0).
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y = 6
x = 2y = 4
19 + y
The solution is (x, y, z) = (2.5, 1, 2.5).
(x, y) = (-6, 0)