(-4)-(-5)+(-8) =-4+5-8 = -7
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Minus a negative means you add: 10.3 - -5 = 10.3 + 5 = 15.3
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To find the additive inverse of ANY number, add a minus sign. (If the number already has a minus sign, take the minus sign away to get the additive inverse.)
It could be any number greater than the minus. For example: -4 + 1 = -3 -4 + 2 = -2 -4 + 3 = -1 -4 + 4 = 0 -4 + 5 = 1 -4 + 6 = 2 and so on.
X2 - 4X - 5 = 0 easy factor, what two factors of - 5 add up to - 4 (X + 1)(X - 5) X = - 1 ------------- X = 5 --------------