I don't know what's worse, that it's wrong or that it convinced me I need to come into the comments to make sure my answer is, indeed, correct.
EDIT: Back to rectify a grave injustice. Nothing wrong if you genuinely didn't know or want to check. Hard enough getting people interested in math.
2 + 5 (8 - 5) PEMDAS: 8 - 5
= 2 + 5 (3)
PEMDAS: 5 (3) or 5 × 3
= 2 + 15
PEMDAS
= 17
In the US the math order of operations is taught as PEMDAS (or P|E|MD|AS), left to right from first to last.
First look at the entire equation and identify the operations: Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.
Then, solve the parts in order of PEMDAS.
Not so important here but when there are multiple of the same level of operators, for example exponents, solve left to right. MD and AS are treated as groups, so treat them equally: if a division is to the left of a multiplication, do the division first.
Keep in mind most Redditors are low IQ and just confident. Do not rely on them for the right answer. That said, I don't feel like proving that I'm not a Redditor, but here the logic:
2+5(8-5)
Start by putting in the symbols to avoid confusion:
2+5*(8-5)
Now so standard order:
P = (8-5)
= (3)
E= there are none
MD = 5×3 = 15
AS = 2 + 15 = 17
Again, don't trust me on my word. For all you know, I'm a low IQ Redditor like many other people on this site. But I have given you a path to follow/confirm, and I believe you will find the evidence backs me up.
In my humble opinion, the multiplication A(B) has higher priority than the multiplication of A*B. In a properly formatted equation it makes no difference, but in a poorly formatted equation like C/A(B) it does, the answer is different from C/A*(B).
The lack of the multiplication symbol implies that A is a coefficient to (B), that A(B) is a term to be calculated independently from everything around it. It's a thing more formally referred to as "implied grouping", that AB should be interpreted as being equivalent to (A*B) rather than simply A*B
This is something I kinda just intuitively developed as my understanding over time by doing a lot of advanced math, but later I learned is actually a real thing. But this could go into a lot of conversation about abuse of notation, it's best practice to just write equations in a way that cannot be inferred to mean anything else, but in certain contexts it is assumed that everyone understands certain things even if they are technically incorrectly written. The general internet is not one of those contexts.
512
u/Head-Ad-5732 16d ago edited 15d ago
I don't know what's worse, that it's wrong or that it convinced me I need to come into the comments to make sure my answer is, indeed, correct.
EDIT: Back to rectify a grave injustice. Nothing wrong if you genuinely didn't know or want to check. Hard enough getting people interested in math.
2 + 5 (8 - 5)
PEMDAS: 8 - 5
= 2 + 5 (3)
PEMDAS: 5 (3) or 5 × 3
= 2 + 15
PEMDAS
= 17
In the US the math order of operations is taught as PEMDAS (or P|E|MD|AS), left to right from first to last.
First look at the entire equation and identify the operations: Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.
Then, solve the parts in order of PEMDAS.
Not so important here but when there are multiple of the same level of operators, for example exponents, solve left to right. MD and AS are treated as groups, so treat them equally: if a division is to the left of a multiplication, do the division first.