23 + 56 - 4 = 75
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Minus 4.
The next number in the sequence 100,96,104,88,120,56 is 184.The pattern is minus 4, plus 8, minus 16, plus 32, minus 64, plus 128
1 + 4 + 4 + 5 + 56 + 3452 = 3522
The discriminant b2-4ac is -23
plus times plus = plus minus times plus = minus plus times minus = minus minus times minus = plus so when you subtract a number it is the same as adding its negative; for example 7 - 4 = 3 7 + (1)(-4) = 3