Question

solve for x where 0<=x<360. your answer should be correct to teh nearest tenth of a degree
a.3cosx+9=7

Answer 1

cos x = -2/3

Answer 2

yes i got 131.8

Answer 3

I have seen this before ....

begin by subtracting 9 from both sides

what is next?

Answer 4

but i want second value

Answer 5

131.8 and 228.2

Answer 6

how to get 2nd one ie 228.2

Answer 7

cos(x) = cos(360-x)

Answer 8

cosine is negative in the 2nd and third quadrants

Answer 9

yes

Answer 10

2/3 gives 48.2 in first quadrant
so third quadrant values is 180 + 48.2 = 228.2

Answer 11

and 2nd quad is 180-x = 180-48.2 = 131.8