Answer:
A
Step-by-step explanation:
Check the solution by substituting x = 
into the left side of the equation
2sin²x - sinx - 1
= 2sin²( ) - sin ( ) - 1
= 2(1)² - 1 - 1
= 2 - 1 - 1
= 0
= right side
is therefore a solution to the equation
The Reference angle for 302 degree is 58 degree.
<h3 /><h3>What is Reference Angle?</h3>
The acute angle formed by the terminal arm or terminal side and the x-axis is known as the reference angle.
There is always a positive reference angle.
The reference angle is, in other words, the angle formed by the terminal side and the x-axis.
Reference angle is given by
Ф = 360° - Given angle
Ф = 360° - 302°
Ф = 58°
Option A is right answer.
To know more about reference angle visit : -
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So the answer is, x1=-2, x2=9
x^2-7x=18
x^2-7x-18=0
x^2+2x-9x-18=0
x*(x+2)-9(x+2)=0
(x+2)*(x-9)=o
x+2=0
x-9=0
X=-2
X=9
I hope u understand!
It's easy it's just 62×9 it equals 558
