Question

solve... cos^2 x+2cos x=0

Answer 1

cosx{cos x + 2) = 0
cos x = 0 or cos x = -2
there is angle with cos = -2
x = 90 degrees or 20 degrees

Answer 2

sorry - no angle with cos = -2
x = 90 or 270 degrees

Answer 3

\[\cos^2 x + 2\cos x=0\]

Answer 4

does this clear things up

Answer 5

He already worked it out above for you. The question to you: does that clear things up?

Answer 6

not really sorry

Answer 7

You have to say what you don't understand; because he did it step for step.

Answer 8

i dont understand what he wrote can you use the equation button

Answer 9

i dont understand what he wrote can you use the equation button

Answer 10

The equation button helps if there is an exponent or a base number. It is just writing an equation.

Answer 11

how about we start from the begining

Answer 12

All he did was 'pull' the cos x out. For example, suppose it was
4+2
That is the same thing as
2(2+1)
That is what he did to your cos x.

Answer 13

oh ok now i get it