ksaimouli
  • ksaimouli
3cosx+9=7 slove for x
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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myininaya
  • myininaya
Subtract 9 on both sides Then divide both sides by 3
ksaimouli
  • ksaimouli
yes i got 131.8 another on ew
ksaimouli
  • ksaimouli
plz say plz

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myininaya
  • myininaya
\[\cos(x)=\frac{-2}{3}\] \[\cos(x)=\cos(x+2 \pi n)\] \[\text{ so we have } \cos(x+2 n \pi)=\frac{-2}{3}\]
myininaya
  • myininaya
Now take arccos of both sides
myininaya
  • myininaya
\[x+2 n \pi=arc \cos(-\frac{2}{3})\]
myininaya
  • myininaya
to solve for x subtract 2npi on both sides
karatechopper
  • karatechopper
@myin on this..i have to learn this for ACT, but how would u solve it exactly? what does cos mean?
myininaya
  • myininaya
|dw:1326937963668:dw|
karatechopper
  • karatechopper
ok.
karatechopper
  • karatechopper
and sin?
myininaya
  • myininaya
opp/hyp
karatechopper
  • karatechopper
opp stands for..........?
myininaya
  • myininaya
opposite
karatechopper
  • karatechopper
so opposite of hypotenuse?
myininaya
  • myininaya
/ means divided by
anonymous
  • anonymous
cos(x) = -2/3 Find the inverse of the cosine, make sure calculator is in degree mode. x = cos^-1(-2/3)
myininaya
  • myininaya
great that's one solution

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