That is correct; to multiply by 2 and then multiply by 2 again is equivalent to multiplying by 4.
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Multiplying by two is the same thing as adding the number to itsself again. 2 (4) = 4 + 4
32, -64 (you are doubling and reversing sign, i.e. multiplying by -2)
is the same as multiplying it. For example: 4 + 4 = 8 = 4*2 4 + 4 + 4 = 12 = 4*3 4 + 4 + 4 + 4 = 16 = 4*4 etc
The difference is that they are both totally different things. When you times something by two you're just doubling it and when you square something you times it by itself. Ex: 1x2=2 2x2=4 3x2=6 These are all doubling. Ex:1 squared is the same as 1x1 2 squared is the same as 2x2 3 squared is the same as 3x3 These are all numbers squared
4