Question

?

Answer 1

plug in (-x) for x (watch your signs carefully)
then count the # of sign changes (+ to - or - to +)

Answer 2

D?

Answer 3

replacing x with (-x) gives us 3(-x)^4 - 5(-x)^3 - 5(-x)^2 +5(-x) +2

^ simplify by canceling out negative signs when possible

then let me know what you get

Answer 4

\[3x^4+5x^3-5x^2-5x+2\]

Answer 5

good, and how many sign changes do you count?

Answer 6

2

Answer 7

A?

Answer 8

good so the final answer ends up being 2 or 0 (after accounting for the possibility of complex roots)

a is correct

Answer 9

cool