Question

x^5 − x^4 + 1 find upper and lower bounds

Answer 1

y = x^5 - x^4 + 1
dy/dx = 5x^4 - 4x^3
=x^3(5x-4)
upper x = 0
lower x= 4/5

Answer 2

Thanks! That's the same answer I got, but I typed it into webassign, and it graded me as wrong :/ Weird.

Answer 3

The real answer was Upper:1 Lower:-1

Answer 4

I figured it out! Thanks. I checked with synthetic division.