find the value of y

If y^(2)-2y-3=0 , find the values of y.

If y^(2)-2y-3=0 , find the values of y.

If y^(2)-2y-3=0 , find the values of y.

If y+siny=cosx , then find the values of 'y' for which dy/dx is valid.

find the value of x+y

find the value of x, y, z

Find the value of x, y and z in the given factor tree. Can the value of x, be found without finding the value of y and z ? If yes, explain.