Let P(x)=2x 4 - 7x 3 + x2 - 18x +3.(a) Use Descartes’ Rule of Signs to determine how many positive and how many negativereal zeros P can have.(b) Show that 4 is an upper bound and -1 is a lower bound for the real zeros of P.(c) Draw a graph of P, and use it to estimate the real zeros of P, rounded to two decimalplaces.(d) Find the coordinates of all local extrema of P, rounded to two decimals.

Algebra and Trigonometry (MindTap Course List)
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Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter3: Polynomial And Rational Functions
Section3.CT: Chapter Test
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Let P(x)=2x 4 - 7x 3 + x2 - 18x +3.
(a) Use Descartes’ Rule of Signs to determine how many positive and how many negative
real zeros P can have.
(b) Show that 4 is an upper bound and -1 is a lower bound for the real zeros of P.
(c) Draw a graph of P, and use it to estimate the real zeros of P, rounded to two decimal
places.
(d) Find the coordinates of all local extrema of P, rounded to two decimals.

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