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 

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