Author Topic: Random pics (Read 3652263 times)

Radical Plato · « **Reply #12575 on:** October 27, 2012, 05:30:12 AM »

Quote from: lovemonkey on October 26, 2012, 06:33:33 AM

Whoever made this had their math all screwed up on five o'clock.

order of operations roots/ multiplication & division/ addition & subtraction

Square root of 9 = 3
3! (or factorial of 3) = 6
9/9 =1
6-1 = 5

Sounds right to me!

lovemonkey · « **Reply #12576 on:** October 27, 2012, 07:13:34 AM »

Quote from: E-Kul on October 27, 2012, 05:30:12 AM

order of operations roots/ multiplication & division/ addition & subtraction

Square root of 9 = 3
3! (or factorial of 3) = 6
9/9 =1
6-1 = 5

Sounds right to me!

Try putting it in brackets instead, like this (9!)^(1/2). This makes it even more obvious to me that 9! comes first.

Besides, Mathematica supports my view. The expression

Sqrt[9!] - 9/9 // N

equals to

601.395

Polish Power · « **Reply #12577 on:** October 27, 2012, 07:42:22 AM »

el numero uno · « **Reply #12578 on:** October 27, 2012, 08:25:28 AM »

Quote from: E-Kul on October 27, 2012, 05:30:12 AM

order of operations roots/ multiplication & division/ addition & subtraction

Square root of 9 = 3
3! (or factorial of 3) = 6
9/9 =1
6-1 = 5

Sounds right to me!

Well, actually the "!" symbol should be outside the square root symbol.

Radical Plato · « **Reply #12579 on:** October 27, 2012, 08:28:57 AM »

Quote from: lovemonkey on October 27, 2012, 07:13:34 AM

Try putting it in brackets instead, like this (9!)^(1/2). This makes it even more obvious to me that 9! comes first.

Besides, Mathematica supports my view. The expression

Sqrt[9!] - 9/9 // N

equals to

601.395

You have changed the equation, their are no brackets in the equation, you must follow the order of operations roots/ multiplication & division/ addition & subtraction. It's not rocket science, it's basic maths, you do the root first, then the multiplication (factorial of square root of 9 which = 3 factorial of 3 = is 1x2x3 = 6 x you then do the division 9/9 which is obvious and then the subtraction last 6-1 = 5. No need for a Computer program to work it out for you, this is high school mathematics, easy enough to work out in your head.

el numero uno · « **Reply #12580 on:** October 27, 2012, 08:36:21 AM »

Quote from: E-Kul on October 27, 2012, 08:28:57 AM

You have changed the equation, their are no brackets in the equation, you must follow the order of operations roots/ multiplication & division/ addition & subtraction. It's not rocket science, it's basic maths, you do the root first, then the multiplication (factorial of square root of 9 which = 3 factorial of 3 = is 1x2x3 = 6 x you then do the division 9/9 which is obvious and then the subtraction last 6-1 = 5. No need for a Computer program to work it out for you, this is high school mathematics, easy enough to work out in your head.

The operation is not written correctly! The factorial symbol is inside the square root so the result is 602.4
It may look like a little mistake but it completely changes the result.

Radical Plato · « **Reply #12581 on:** October 27, 2012, 08:39:13 AM »

It is written correctly, a factorial is a multiplication and is performed after the square root. It doesn't matter that the factorial is written inside the square root, you always follow the order of operations. You are performing multiplication (the factorial) before the roots, for eg. The square root of 9 x 3, you always perform the square root first, so the equation would then become 3 x 3 which = 9 and not the square root of 27 which = 5.196

el numero uno · « **Reply #12582 on:** October 27, 2012, 08:47:58 AM »

Quote from: E-Kul on October 27, 2012, 08:39:13 AM

It is written correctly, a factorial is a multiplication and is performed after the square root. It doesn't matter that the factorial is written inside the square root, you always follow the order of operations. You are performing multiplication (the factorial) before the roots, for eg. The square root of 9 x 3, you always perform the square root first, so the equation would then become 3 x 3 which = 9 and not the square root of 27 which = 5.196

Yes it matters, you can completely change the result by doing that mistake.

There's a difference betwee these operations below. In the left one the result is 9. In the other one, the result is 5.2. The same happens with the one we're talking about.

herne · « **Reply #12583 on:** October 27, 2012, 08:48:06 AM »

herne · « **Reply #12584 on:** October 27, 2012, 08:50:17 AM »

lovemonkey · « **Reply #12585 on:** October 27, 2012, 08:52:49 AM »

Quote from: E-Kul on October 27, 2012, 08:28:57 AM

You have changed the equation, their are no brackets in the equation, you must follow the order of operations roots/ multiplication & division/ addition & subtraction. It's not rocket science, it's basic maths, you do the root first, then the multiplication (factorial of square root of 9 which = 3 factorial of 3 = is 1x2x3 = 6 x you then do the division 9/9 which is obvious and then the subtraction last 6-1 = 5. No need for a Computer program to work it out for you, this is high school mathematics, easy enough to work out in your head.

I didn't change anything.. just a different way of writing the expression. The basic root symbol and the exponent ^(1/2) are one and the same. I have never encountered an example where this is not true. The proper way of writing that expression is sqrt(9)!-9/9=5. The fact that Mathematica looks at it the same way is a strong indicator to me that I'm not deluding myself.

herne · « **Reply #12586 on:** October 27, 2012, 09:06:51 AM »

Radical Plato · « **Reply #12587 on:** October 27, 2012, 09:32:59 AM »

Quote from: lovemonkey on October 27, 2012, 08:52:49 AM

I didn't change anything.. just a different way of writing the expression. The basic root symbol and the exponent ^(1/2) are one and the same. I have never encountered an example where this is not true. The proper way of writing that expression is sqrt(9)!-9/9=5. The fact that Mathematica looks at it the same way is a strong indicator to me that I'm not deluding myself.

It's a tough one, An exclamation mark indicates that one should compute the factorial of the term immediately to its left, the term immediately to the left of the factorial is what is the square root of 9. which is 3. I might have to research this one a but further, you could be right, factorials are funny things!