Answer:
4
Step-by-step explanation:
Given the equation :
2x²+ (4- k)x - 17 = 0
a = 2, c = - 17 b = (4 - k)
For the equation above to have one root; equal but opposite in sign
Then;
(ax + c) = 0 and b = 0
Since b = 0, the we can solve for k
b = 4 - k
b = 0
4 - k = 0
4 = k
