October 9, 2015

Homework Help: Pre-Calc/Trig

Posted by Jaclyn on Monday, September 12, 2011 at 10:53am.

Please check the first and help with the second-thank you
Find all possible rational roots of f(x) = 2x^4 - 5x^3 + 8x^2 + 4x+7

1.I took the constant which is 7 and the leading coefficient which is 2 and factored them
7 factored would be 7,2
2 factored would be 2,1
used 7 as numerator 2 as denominator came up with 1/2,1/7/2, 7 Would that be correct?

2.I don't get this one find number of possible positive and negative real roots of f(x) = x^4-x^3+2x^2 + x-5
I think there are 3 sign changes so there are 3 positive but I get really confused on doing the negative real zeros would I rewrite for negative f(x) = -x^4 -(-x^3) -2x^2 -(x-5) so there would be 2negative real zeros

I don't get this one

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