Question

To three decimal places, find the value of the first positive x-intercept for the function f(x) = 2cos(x + 3)

Answer 1

What do you think? Where do we start?

Answer 2

is it 1.712 @raffle_snaffle

Answer 3

@freckles

Answer 4

to find x-intercept set f(x)=0
solve 0=2cos(x+3) for x

Answer 5

I would divide both sides by 2 first
0=cos(x+3)

Answer 6

do you know how to solve cos(x+3)=0?

Answer 7

do you know when cos(u)=0?

Answer 8

also you did approximately find x such that is the first positive x-intercept of the function you gave
do you want the actual
or approximation will do?