Hi,         

solving the quadratic equation by factoring: 

  15x^2-2x-8=0

(5x -4)(3x +2)= 0 Note:SUM of the inner product(-12x) and the outer product(10x) = -2x

 (5x -4)(3x +2)= 0

 (5x -4)= 0

     x = 4/5

  (3x +2)= 0

     x = -2/3 

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