The existence, for the number 18, of an additive inverse which is -18.
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Its like reversing the procedure of minus. For example, in -(-1) , you are actually inverting the minus sign with the minus sign outside the bracket to become a positive 1. So in general, -(-x) is equal to x. well every time you see negative x negative gives you a positive. and a negative time a positive makes it negative. here are some examples: (-) (-)= (+), (-) (+)= (-)
Try the discriminant. b^2 - 4ac (-3)^2 - 4(2)(16) 9 - 128 < 0 so, no real roots here
Here's your problem: 3004 - 2106 = 898.
Five minus seven is negative two. Here's a trick: switch the numbers around and then take your answer. Give it a minus sign.
19