Question

How do I solve this problem a) pib) 3pi/2 c) No solution d) 0

Answer 1

We need to solve the equation

cos x + 1 = 0

I order to do so, let's subtract 1 from both sides of the equation:

cos x + 1 - 1 = 0 - 1

cos x = -1

Now, the solution to this equation is the value of x for which cos x equals - 1. Since

cos π = -1

we have x = π.

Therefore, the answer is

a) pi