What is the range of all the roots of |x^2 - 4| = x ?	Choose the correct choice:
A) 4	B) 3	C) 2	D) 1	E) 0
we get 2 quadratic equations here ..   1) x^2-x-4=0 ....... roots 2 , -1   2) x^2+x-4=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=4 or x=1   I guess range is   4-1= 
<gadget id="calculator">  4-1</gadget>
<output>3</output>
3   3
<result>B</result>
What is the range of all the roots of |x^2 - 4| = x ?