The interior of a triangle = 180°
So 180° - 85° -50° = 45°
c. 45 degrees
Use the Quadratic formula,
x= -b +/- sqrt(b^2-4ac)
-------------------------
2a
x= 4 +/- sqrt(16+12)
----------------------
-6
x = 4+/- sqrt(28)
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-6
x = 4 +/- 2*sqrt(7)
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-6
x= 2(2+/- sqrt(7))
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2(-3)
x= 2+/- sqrt(7)
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-3
Answer:
It is D (-23, -7, 5, 9, 190)
Step-by-step explanation:
:)
