What is the range of all the roots of |x^2 - 1| = x ?	Choose the correct choice from the following:
A) 4
B) 3
C) 2
D) 1
E) 0
we get 2 quadratic equations here ..   1) x^2-x-1=0 ....... roots 2 , -1   2) x^2+x-1=0 ........ roots -2, 1   Inserting each root in given equation , it can be seen that -1 and -2 do not satisfy the equations .   So value of x for given equation .... x=2 or x=1   I guess range is   2-1= 
<gadget id="calculator">  2-1</gadget>
<output>1</output>
1   1
<result>D</result>
What is the range of all the roots of |x^2 - 1| = x ?