Question

Given the polynomial f(x)=10x^5−7x^3+6x+21
What one of the following is a possible rational root?

Answer 1

@saseal can you explain this

Answer 2

theres no rational root according to newton's method...

Answer 3

thats not an option . these are the answer choices


a. 9 / 6
b. 6 / 8
c. 5 / 20
d. 7 / 5

Answer 4

try something around 1.056

Answer 5

the graph of this thing touches the x axis only 1 time

Answer 6

9/6 = 1.5
6/8=.75
5/20=.25
7/5=1.4

Answer 7

ok try plugging in all the options into the equation and see which one ends up begin 0

Answer 8

ok