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Rashid [163]
3 years ago
7

Given that 2sin^2 theta + sin theta -1 = 0, find the two values for sin theta.

Mathematics
1 answer:
Lisa [10]3 years ago
8 0
2sin^2 θ + sin θ - 1 = 0
2sin^2 θ + 2sin θ - sin θ - 1 = 0
2sin θ(sin θ + 1) - 1(sin θ + 1) = 0
(2sin θ - 1)(sin θ + 1) = 0
2sin θ - 1 = 0 or sin θ + 1 = 0
sin θ = 1/2 or sin θ = -1

The two values of sin θ are 1/2 and -1


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