SOLUTION: What is the value of k so that the equation 2x2 + 4x - 17 = kx has roots numerically equal but opposite in sign?

Question 998656: What is the value of k so that the equation 2x2 + 4x - 17 = kx has roots numerically equal but opposite in sign?
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!

-----Is that discriminant a perfect square?
2*75,3*50,5*30,6*25,10*15, does not seem to be; this will actually not be important.

The requirement is that the roots, the possible x values, must be equal in size but opposite
in their signs. That is, they are additive inverses of each other.
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