Question 381585
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Hi,
If I am understanding the Question properly:
Note:SUM of the inner product(10*x) and the outer product(-10x) = 0
(2x+5)(2x-5)= 0 
 4x^2 - 25 = 0
 4x^2 = 25
  x^2 = 25/4
   x = ±  5/2