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The graph of $y=x^3-4x$ is shown in the figure. How many zeroes does the polynomial $x^3-4x$ have? 
A$1$
B$2$
C$3$
D$4$
Answer & Solution
Correct answer: C. $3$
The zeroes are the $x$-coordinates where the graph intersects the $x$-axis. In the figure, the curve meets the $x$-axis at three points: $x=-2$, $x=0$, and $x=2$. So the polynomial has 3 zeroes.
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