3x^2 - x + 4
x^2 + 4x - 2 [ 3x^4 + 11x^3 + kx^2 + 18x - 8 ]
3x^4 + 12x^3 - 6x^2
___________________________
-1x^3 + (k + 6)x^2 + 18x
-1x^3 - 4x^2 + 2x
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(k + 10)x^2 + 16x - 8
4x^2 + 16x -8
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(k + 6) x^2
k + 6 = 0
k = -6
+4 
