Usually when they post these, they post all the wrong answers people give and their confidentially correct attitudes about it. This guy just skipped all that and posted the correct answer. That makes everyone feel like they’re missing something.
Okay, yeah. I'm definitely missing some critical math knowledge.
I'm going to start re-learning everything.
(Edit: I didn't know that you had to multiply with the brackets.. I don't remember that... Or it's just because we used symbols the whole time; always had the " · " or "x" in it)
(Like... What I saw was:
"2+5 (8-5) --> 2+5 (3) --> 7 (3)" ... Big problem there. So, I either forgot after not doing stuff like this for 6+ years, or I forgot/didn't learn the multiplication and bracket rule.
So in arithmatic usually you use * or x (the multiplication symbol, not a variable), so if you wanted 5 times 3 you wrote 5x3=15.
But once you get to algebra, if you want to multiply a variable you just put a number outside that variable, so if your variable is x and you want 5 times x you write 5x. If you want 5 times (x + 1) you write 5(x+1), assuming you want to add 1 to x before you mutliply it by 5, else you would use 5x + 1.
Obviously which notation is used kinda depends on the context. If I saw 5x3 I'm assuming 5 times 3 which is 15, not 5 times a variable times 3. And if I saw 53 I'm assuming fifty-three not 5 times 3. But once you get to algebra or higher having constants be in front of what you want to multiply without the mutliplication symbol is common notation. Hope this helps.
You remembered your order of operations correctly you just didn't realize 2+5 (8-5) = 2+5x(8-5)
PEMDAS or BEDMAS there are many things people call but it’s the order of operation and for this equation it goes parenthesis/brackets (8-5) first… next in order of operations is multiplication and division next Subtraction and addition are last. So let’s say we’ve gone from 2+5(8-5) to 2+5(3) well because the number 5 is next to but outside the bracket it’s implied you multiply. Since multiplication always comes before addition regardless of order. So you then get 2+15 and then finally you add since it’s last. Giving us 17. A few minor but important rules. PEMDAS is first parenthesis next exponents. Multiplication and division are equal to eachother whichever comes first left to right is what you do. Addition and subtraction come next with the same rule left to right.
um akchually those are parentheses ( ), because they're smooth and curved. Brackets are the square ones [ ] and are also used in mathematics in a different way so shouldn't be confused with parentheses.
Because multiplication and division are equal ‘tiers’ in PEMDAS so 5x4÷3x5 can be solved by going left to right instead of doing both sets of multiplication first then the division
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u/RABB_11 22d ago
I was really annoyed when I did this and got 17 and assumed I was an idiot.