Question

Which of the following is a solution to 2sin^2x+sinx-1=0?

A. 45 degrees
B. 200 degrees
C. 240 degrees
D. 270 degrees
E. 330 degrees

Answer 1

`x = (\pi )/(6) + 2\pi n, (5\pi )/(6) + 2\pi n, (3\pi )/(2) + 2\pi n`, for any integer n

Answer 2

D or 270°

Explanation:

2sin^2x+sinx-1

2sin^2(270°)+sin(270°)-1=0