polynomial functiomscheck
posted by Jesse .
Can you please check my work and answers.
Find the xintercepts of the polynomial function. State whether the graph crosses the xaxis, or touches the xaxis and turns around, at each intercept.
1.f(x) = (x + 1)(x  3)(x  1)^2
I got 1 crosses the xaxis, 3 crosses the xaxis, 1 touches the xaxis and turns around
5.f(x) = x^4  16x^2
 I got x^2(x^216)
(x+4)(x4)
0 touches the xaxis and turns around; 4 crosses the xaxis; 4 crosses the xaxis
7.x^4 + 5x^3  84x^2 = 0
I got 0 touches the xaxis and turns around;12 crosses the xaxis; 7 crosses the xaxis
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