Answer:
-7.
Step-by-step explanation:
-|-2 + 9| = -|7| = -7.
2x + x = 180
This is because 2x is on one side while x is on the other, if those two angles add up they must add up to 180 because the two angles form a 180 degree angle or just a straight line
2x + x = 180
3x = 180
x = 60
Q = {-10, 7}
sorry for the late response I hope this helps you.
Cos x + 2sec x = -3
cos x + 2/cos x = -3
cos^2 x + 2 = -3cos x
cos^2 x + 3cos x + 2 = 0
(cos x + 1)(cos x + 2) = 0
cos x + 1 = 0 or cos x + 2 = 0
cos x = -1 or cos x = -2 [but cos x cannot be -2, so we discard it]
x = arccos(-1)
x = (2n + 1)π