<PRE><B>Question 925683</B>
PLEASE HELP ME IF ANYONE CAN
FOR WHICH OF THE FOLLOWING EQUATIONS IS X=-2 a ROOT?
(1)2/X-X=0
(2)X^2+4=0
(3)X^7+4X+4=0

did all 3 below 

(1) 2/x - x = 0
    (2 - x^2)/x = 0 (using common denominator x)
     2 - x^2 = 0
      -x^2 = -2
       x^2 = 2
   ((( x = +- sqrt(2) )))

(2) x^2 + 4 = 0
      x^2 = -4 
      x^2 = -1 * 4
       x = i * +-2
       x = +- 2i  (i is the imaginary root of -1)

(3) x^7 + 4x + 4 = 0
well I certainly not gonna do this one
I think you mean x^2 + 4x + 4 = 0 and did a typing error

x^2 + 4x + 4 = 0
(x + 2)(x + 2) = 0 (use FOIL (first outer inner last) and you will see it equals previous line)
x = -2
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