anonymous
  • anonymous
What is the x-coordinate for the minimum point in the function f(x) = 4 cos(2x − π) from x = 0 to x = 2π? x = pi over 2 x = pi over 4 x = 2π x = π
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
@aloud @phi @mathmate
phi
  • phi
do you know what cos looks like from 0 to 2pi? https://www.google.com/search?q=cos%28x%29&gbv=2&sei=FSSEVeKzLIevsAWqqoKYAQ
anonymous
  • anonymous
i thought it intercepts at -4

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phi
  • phi
the smallest value will be y= -4 for a "normal cosine" from 0 to 2pi, the minimum value is at pi (exactly half way from 0 to 2pi)
anonymous
  • anonymous
no I dont know how to graph them that well
phi
  • phi
so you want to find where the "angle" of your problem f(x) = 4 cos(2x − π) from x = 0 to x = 2π equals pi in other words, what is "x" so that 2x - pi = pi
anonymous
  • anonymous
would you plug in the x=0 for the x in 2x-pi=pi
anonymous
  • anonymous
like substitution
phi
  • phi
The easiest way is to look at a graph: https://www.google.com/search?q=cos%28x%29&gbv=2&sei=FSSEVeKzLIevsAWqqoKYAQ#q=4+cos%282x+%E2%88%92+%CF%80%29
phi
  • phi
but using algebra 2x - pi = pi add +pi to both sides 2x - pi + pi = pi+pi on the left -pi+pi add up to zero. on the right you get 2pi 2x = 2pi now divide both sides by 2
anonymous
  • anonymous
it would be x=pi because the 2's would cancel right?

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