Is that a minus sign in between the x) and x=8?
27°
The angle which a chord subtends at the centre of a circle is twice the angle it subtends on the circumference.
i.e
√(-80) = √(4²×5(-1)) = 4√5 √(-1) = 4√5i.
The decimal for 8 is 6.2 and the decimal for 9 is 7.0. Hope this helps you!
