Find the x-intercepts of the polynomial function. State whether the graph crosses the x-axis, or touches the x-axis and turns around, at each intercept. f(x) = x4 - 9x2

A. 0, crosses the x-axis;
3, crosses the x-axis;
-3, crosses the x-axis
B. 0, touches the x-axis and turns around;
9, touches the x-axis and turns around
C. 0, touches the x-axis and turns around;
3, crosses the x-axis;
-3, crosses the x-axis
D. 0, touches the x-axis and turns around;
9, crosses the x-axis


Answer: C

Mathematics

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B. Stretched horizontally

C. Stretched vertically; 
reflected across the y-axis

D. Stretched horizontally; 
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A. 4 
B. 125
C.
D.

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