Question

3cosx+9=7 slove for x

Answer 1

Subtract 9 on both sides
Then divide both sides by 3

Answer 2

yes i got 131.8 another on ew

Answer 3

plz say plz

Answer 4

\[\cos(x)=\frac{-2}{3}\]
\[\cos(x)=\cos(x+2 \pi n)\]
\[\text{ so we have } \cos(x+2 n \pi)=\frac{-2}{3}\]

Answer 5

Now take arccos of both sides

Answer 6

\[x+2 n \pi=arc \cos(-\frac{2}{3})\]

Answer 7

to solve for x subtract 2npi on both sides

Answer 8

@myin on this..i have to learn this for ACT, but how would u solve it exactly? what does cos mean?