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March 31, 2015

March 31, 2015

Posted by **Tyra** on Monday, October 15, 2007 at 8:58pm.

Find the zeros for the polynomial function and give the multiplicity for each zero. State whether the graph crosses the x-axis or touches the x-axis and turns around, at each zero.

f(x) = 2(x - 2)(x + 4)^4

2(0-2)(0+4)^4 thats all I know

f(x) = 3(x - 3)(x - 6)^3

3(0-3)(0-6)^3

f(x) = -4(x - 5)^3

-4(0-5)^3

- ap algebra -
**bobpursley**, Monday, October 15, 2007 at 9:04pmTake the first one:

the first zero is at x=2 (it makes the first term zero) the second zero is at x=-4

Now, for crossing the x axis (does the function change sign..take the x-2 term. If x <2, it is negative, if x>2, it is positive, so the function must cross the x axis at x=2. If it didnt change signs (check the (x+4)^4 term)), it much touch the x axis.

I will be happy to critique your thinking.

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