anonymous
  • anonymous
if the point(x, sqrt 3/2) is on the unit circle, what is x
Trigonometry
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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jim_thompson5910
  • jim_thompson5910
The point is \[\Large \left(x, \frac{\sqrt{3}}{2}\right)\] right?
anonymous
  • anonymous
yes
jim_thompson5910
  • jim_thompson5910
Notice how that point is the form (x,y) where \[\Large y = \frac{\sqrt{3}}{2}\] Do you agree with this statement?

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anonymous
  • anonymous
yes
jim_thompson5910
  • jim_thompson5910
Now plug this y value into the unit circle equation and solve for x \[\Large x^2+y^2 = 1\] \[\Large x^2+\left( \frac{\sqrt{3}}{2}\right)^2 = 1\] \[\Large x^2+ \frac{\left(\sqrt{3}\right)^2}{2^2} = 1\] \[\Large x^2+ \frac{3}{4} = 1\] Do you see how to solve for x from here?
anonymous
  • anonymous
no
jim_thompson5910
  • jim_thompson5910
how would you move the 3/4 to the other side? what must you do to both sides?
jim_thompson5910
  • jim_thompson5910
hint: you need to undo the addition
anonymous
  • anonymous
subtract 3/4 from each side
jim_thompson5910
  • jim_thompson5910
yes, that gives you \[\Large x^2+ \frac{3}{4} = 1\] \[\Large x^2+ \frac{3}{4}\color{red}{- \frac{3}{4}} = 1\color{red}{- \frac{3}{4}}\] \[\Large x^2 = 1- \frac{3}{4}\] \[\Large x^2 = \frac{4}{4}- \frac{3}{4}\] \[\Large x^2 = \frac{4-3}{4}\] \[\Large x^2 = \frac{1}{4}\]
jim_thompson5910
  • jim_thompson5910
Now if \[\Large x^2 = \frac{1}{4}\] then what must x be? How would you isolate x?
anonymous
  • anonymous
1/2
jim_thompson5910
  • jim_thompson5910
x = 1/2 is one solution what is the other?
anonymous
  • anonymous
i don't know
jim_thompson5910
  • jim_thompson5910
hint: take a number like 10 and square it to get 100. You can also square -10 to get 100 as well since (-10)^2 = (-10)*(-10) = 100 so that's why the solutions to x^2 = 100 are x = -10 or x = 10

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