If we express -2x^2 + 6x - 8 in the form a(x - h)^2 + k, what is k?
-2x^2 + 6x - 8
-2 (x^2-3x) - 8
-2 (x^2 - 3x + 2.25) + 4.5 - 8
-2 (x- 1.5)2 - 3.5
+37163 
