When the expression -2x^2 - 50x + 23 is written in the form a(x + d)^2 + e, where a, d, e and are constants, then what is the sum a + d + e?
-2x^2 - 50x + 23
-2 (x^2 +25x) + 23
-2(x+12.5)2 +312.5 + 23
-2(x+12.5)2 + 335.5