Maths Q

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Wow! I didn't even notice. I must have too much time on my hands or ETO is a very good distraction. I suspect the latter.
 
Let's take a function: f(x)=-x²

Here, when we substitute numbers for x, we assume: f(x)=-(x²) or f(2)=-(2²)=-4

Or at least in everything I have come across so far.
 
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