Digital SAT Math Practice Question #1324
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Desmos slider: Graph both equations, add slider for $c$, and find the integer $c$ where the line is perfectly tangent to the parabola.
Set the equations equal to find intersection $x$-coordinates: $$2x^2 - 4x + c = 4x - 9 \implies 2x^2 + (-8)x + (c + 9) = 0.$$ For the line and parabola to intersect at exactly one point, the discriminant must equal zero ($b^2 - 4ac = 0$): $...
Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...
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