The value Pi /2
is a solution for the equation 2 sin^2 x- sin x-1=0.
O A. True
B. False

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

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

answer: plz put a pic in so i can answer it

step-by-step explanation: