Ask
your own question, for FREE!

Mathematics

OpenStudy (anonymous):

solve for 0<θ<2(3.14[pi]): 9cos^((2))θ-2cosθ-3=0 give answer in terms of 3.14[pi]

Still Need Help?

Join the QuestionCove community and study together with friends!

sam (.sam.):

Since it can't be factored, you need to use the quadratic formula. \[\cos(\theta)=\frac{-b \pm \sqrt{b^2-4ac}}{2a}\] \[\cos(\theta)=\frac{-(-2) \pm \sqrt{(-2)^2-4(9)(-3)}}{2(9)}\] \[\cos(\theta)=\frac{2 \pm \sqrt{112}}{18}\] ------------------------------------------- \[\cos(\theta)=\frac{2 + \sqrt{112}}{18}~~~\text{and}~~~\cos(\theta)=\frac{2 - \sqrt{112}}{18}\] ----------------------------------------- Take the inverse of both trigo and get \(\theta\)

sam (.sam.):

You'll need this too|dw:1338189692205:dw|

Can't find your answer?
Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!

Join our real-time social learning platform and learn together with your friends!

Latest Questions

sophia333:
I feel really stupid, but like ineedhelpwithmylittlecousinshomeworkandiwentthroughthisinschoolbutimstupid :< Mikayla bought 5 skirts at $x each.

13 seconds ago
3 Replies
0 Medals

PinkGlitterz:
what is (x - 1)/(x^2 - 2x) - 2/(x^2 - 4) = 0 show all the steps to get there please.

6 minutes ago
11 Replies
0 Medals

Wadfasd:
The graph shows the relationship between the number of months different students practiced tennis and the number of matches they won: The title of the graph

1 minute ago
74 Replies
3 Medals

ThatBoiRay17:
At the mall 5 out of every 25 shoppers were wearing a dress. Based on this inform

20 minutes ago
18 Replies
2 Medals

Alexa01:
Some scientists think we should be spending time and money developing vaccines for diseases that may in the future become pandemics, so that we are ready wh

1 minute ago
8 Replies
0 Medals

yeet12:
Which statement about the result of the growth of railroads in the 1800s is false? Raw materials could be shipped to factories year round.

51 minutes ago
17 Replies
0 Medals

Extrinix:
I've found the one. The one that fits me almost perfectly. Love is never perfect, but it can get close.

10 minutes ago
38 Replies
6 Medals

StormyGem:
Of the 35 jewelers in her town, Naomi polled the 5 biggest to learn about the latest jewelry trends.

1 hour ago
12 Replies
2 Medals