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2x2 + 3x - 20 = (x + 4)(2x - 5).
The discriminant is 1.
d/dx 2x2+3x+7=4x+3
y=3x+12
If 2x2 + 3x + 9 = 0 then x = -0.75 - 1.984i or -0.75 + 1.984i where i is the imaginary square root of -1.