Not really. He's breaking the exact same rule when he distributes the x instead of multiplying the left side of the equation by x (to change the equation to 48*12=288*x).Replacing 2 with an x changes the equation. In order to find out the value of x, you have to follow a different order of operations than you do to evaluate the expression posed in the OP.
From physicsforum.com user RJS
Re: 48÷2(9+3)
Looking at it like this though:
48 ÷ x(9 + 3) = 288
48 ÷ 9x + 3x = 288
48/12x = 288
4/x = 288
4 = 288x
4/288 = x
1/72 = x
Would suggest that 288 is wrong, and that 2 is correct.
From physicsforum.com user RJS
48 ÷ x(9 + 3) = 288
48 ÷ 9x + 3x = 288
48/12x = 288
4/x = 288
4 = 288x
4/288 = x
1/72 = x
that 288 is correct to show that the real answer is 2 ?
umm ... your math is wrong.
this is elementary shit too.
wow the fail in this thread is so fucking fail it amazes me.
Re: 48÷2(9+3)
It can be written that way if you assume a particular meaning- but the expression as given is ambiguous and cannot be correctly evaluated without assuming something not given.
You, basically, assumed the "correct" answer was 288 and, no surprise, arrived at that answer.
...but most mathematicians would agree that the implied multiplication takes precedence over the division.
No, they don't. Show me a reputable source that says such a thing, and your head doesn't count. It's always left to right when division and/or multiplication is involved. Aren't you a teacher as well? lmao
I've seen alot of people talking about how implied multiplication takes precedence over regular pemdas.
How have we as a species come so far, with something this basic being contested?
48 / 2 (9 + 3)
48 / (18 + 6)
48 / 24
2
As a mathematician and computer scientist all I can say is that you can't evaluate the expression without first providing a definition for the function 2(x). Evaluating that expression as an implied multiplication is formally incorrect. Rewriting it symbolically you get x/f(y+z).
However, assuming it is implying 48/2*(9+3) then the answer is of course 288.
Equation? Are you the first person in this thread to call that expression an equation?
Incidentally, upon further thought, I agree with Matthiasa - there's no real consensus in mathematics for such a poorly written expression, but most mathematicians would agree that the implied multiplication takes precedence over the division.
No, they don't. Show me a reputable source that says such a thing, and your head doesn't count. It's always left to right when division and/or multiplication is involved. Aren't you a teacher as well? lmao
2/xy would be interpreted by most people to mean 2 divided by the product of x and y. Not 2y/x
However, I don't think I've EVER seen such an ambiguous expression in any math textbook.
2/xy would be interpreted by most people to mean 2 divided by the product of x and y. Not 2y/x
However, I don't think I've EVER seen such an ambiguous expression in any math textbook.
2/xy would be interpreted by most people to mean 2 divided by the product of x and y. Not 2y/x
However, I don't think I've EVER seen such an ambiguous expression in any math textbook.