Your math needs some work. x(9+3) != x * (9+3)
x is the factor of (9+3)
eg. x =2
2(9+3) == 1(18 + 6) == 3(6+2)
Can't believe I have to explain this..
!= x * ab
= xa + xb
We linearize simple formulas, using the rule that multiplication indicated by juxtaposition is carried out before division.
From the American Mathematical Society, people:We linearize simple formulas, using the rule that multiplication indicated by juxtaposition is carried out before division.
Admittedly a very old document (10 years), but I don't think it's probable that the AMS has changed its mind about this in the interim, do you? If so, cite.
The answer is 2. This is indisputable
ETA: To be clear, the answer is 2 if you follow the convention followed by professional mathematicians. There's nothing magical about that convention and you're welcome to use whatever convention you want--but if you use one other than what the pros use, you're likely to cause communication problems.
*SIgh* WAY doesn't belong here, but:
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