Question

At what point the graph of f(x) = 2cos x – 1 intersects the x-axis?
A.pi/6
B. pi/4
C. pi/3
D. pi/8

Answer 1

@jim_thompson5910

Answer 2

you can plug in each answer choice

Answer 3

the choice that gives you y = 0 is the answer

Answer 4

plug it in? @jim_thompson5910

Answer 5

plug in x = pi/6 and you get y = ????

Answer 6

.73... @jim_thompson5910 so thats wrong?

Answer 7

let me check

Answer 8

its pi/3! :) @jim_thompson5910

Answer 9

yes 0.73 is correct, it's not 0

so that choice is eliminated

Answer 10

yep, pi/3 is right