Question: Show that each polynomial function has a real zero as described in parts (a) and (b). In Exercises 39 and 40, also work part (c).

Show that each polynomial function has a real zero as described in parts (a) and (b). In Exercises 39 and 40, also work part (c).

ƒ(x) = 6x4 + 13x3 - 11x2 - 3x + 5

(a) no zero greater than 1 

(b) no zero less than -3

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