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Which figure shows a quadratic polynomial with exactly one zero?    
AFig. with image_id img-3.jpeg
BFig. with image_id img-4.jpeg
CFig. with image_id img-7.jpeg
DFig. with image_id img-8.jpeg
Answer & Solution
Correct answer: B. Fig. with image_id img-4.jpeg
A quadratic has exactly one zero when its graph touches the $x$-axis at one point only. In img-4.jpeg, the parabola touches the $x$-axis at a single point. In img-3.jpeg it cuts the axis at two points, while img-7.jpeg and img-8.jpeg do not meet the $x$-axis.
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