Question

Been stuck for awhile... How to use calculator?
Enter this in calculator: 2sin(2x)-5 cos(2x)
Find x-intercept closest to x=0

Answer: 0.60

Answer 1

What do I trace on my calculator to get 0.60?

Answer 2

http://desmos.com/calculator

Answer 3

http://fooplot.com/#W3sidHlwZSI6MCwiZXEiOiIyc2luKDJ4KS01Y29zKDJ4KSIsImNvbG9yIjoiI0U2MEUwRSJ9LHsidHlwZSI6MTAwMCwid2luZG93IjpbIi05Ljg5MTY0MDA2NDc4NzY4NSIsIjExLjU4MzE5NjQxNTIxMjMwMSIsIi03LjA4MTg2MzgxODYzMzg0MSIsIjYuMTMzNDIwMTY5MDU4NDU0Il19XQ-- use the middle-mouse-button to zoom in/out

Answer 4

@jdoe0001 After I graph it how do I calculate the x-intercept?
I know I am supposed to do 2nd-trace but then I don't know what to do next.

Answer 5

x-intercept -> where the graph TOUCHES the x-axis, that is, where the graph INTERCEPTS the x-axis

Answer 6

you could just zoom in to it

Answer 7

and get an approximate value, if that's what you're expected to do

Answer 8

@jdoe0001 Thank you very much:)

Answer 9

yw