this post was submitted on 27 Nov 2025
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Hrmm.
I read that as resulting in 21.
My education system did fail me.
I plugged that into ghci as 2+5*(8-5), and it says 17.
:(
I did (2+5)*(8-5).
Doh.
[Edit: (Double doh! Mistyped that here as 5+2. XD)]
You do parenthesis first and then multiplications and then sums, you did parenthesis, then sums, then multiplications, wich is wrong.
You don't necessarily have to do parentheses first. What matters is that the things inside the parentheses are a group that you can't break apart. If you have
10÷2+3-2*(2+1)you can do the division first5+3-2*(2+1)then the addition outside the parentheses8-2*(2+1)It's just that before you do the multiplication of the term outside the parentheses, you have to handle the parentheses group, so you get8-2*3->8-6->2Yes, you do necessarily have to do it first
And outside, and you must do them first. You haven't finished Brackets until you have 5(8-5)=15.
only because you've separated that part with a plus sign
There aren't any, only Addition and Brackets (and Subtraction inside Brackets)
Uh huh.
You might want to report that error. Or, did you mean 2+5*(8-5)?
Oops! Typo. School failed me hard!
[Edit: Thanks. Corrected that.]
How far along in school are you btw?
over 20 years past giving up on school [in 2nd year of college], when they kept failing me.
Aha.
The problem is you can't just add parenthesis willy nilly, that breaks the whole equation!
Well, it used to be a free country until common core and now this nonsense is the result. Numbers and punctuation mixed together. Pure chaos.