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Vivix2 - 3x -28 = 0
move the constant
x2 - 3x = 28
take half of the x term (1.5), square it (2.25), and add to both sides
x2 - 3x + 2.25 = 2.25 + 28
The left side is now a perfect square, simplify
(x - 1.5)2 = 30.25
Taking the square root of both sides, you find that
x - 1.5 = ±5.5
So...
X1 = 1.5 + 5.5 = 7
X2 = 1.5 - 5.5 = -4
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