My Math Forum solving equation problem

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 October 2nd, 2008, 08:11 AM #1 Newbie   Joined: Oct 2008 Posts: 5 Thanks: 0 solving equation problem I need help with the following equation. The answe should be 64. 8 * 20 - 9 - 5 / 2square
 October 2nd, 2008, 12:22 PM #2 Member   Joined: Aug 2008 Posts: 44 Thanks: 0 Re: solving equation problem First you need to know the order of operations. The most important rules extracted from the given site are: Code: 1. Calculations must be done from left to right. 2. Calculations in brackets (parenthesis) are done first. When you have more than one set of brackets, do the inner brackets first. 3. Exponents (or radicals) must be done next. 4. Multiply and divide in the order the operations occur. 5. Add and subtract in the order the operations occur. $8 * 20 - 9 - \frac{5}{2^2}$ Following the rules, we see that you must first deal with radical (rule [color=#008040]3.[/color]) $2^2=4$. Then we do with multiplication and division: $8 * 20=160$ and we leave fraction as is $\frac{5}{4}$. From here on, I think you should do fine (assuming that your at ease with subtraction and that the order is what troubles/d you). EDIT: Should the answer be 64, I've either misinterpreted the given numbers, or please complement with more information.
 October 2nd, 2008, 03:31 PM #3 Newbie   Joined: Oct 2008 Posts: 5 Thanks: 0 Re: solving equation problem The actual equation is: 8 * 20 - 9 - 5 / 2squared (not 5 over 2 squared, but 5 divided by 2 squared) The answer is supposed to be 64 by putting the correct brackets and parenthesis.
 October 2nd, 2008, 05:54 PM #4 Senior Member   Joined: Jul 2008 Posts: 895 Thanks: 0 Re: solving equation problem No-one can show you without just simply doing it for you. That's what makes it the type of problem it is. I can do it, but if it is homework, or an assignment for extra marks, who earns them? you or me? I'll post the answer in a day or two unless someone else does it for you. One hint: The part after 8* will be equal to 8 when done.
 October 2nd, 2008, 08:00 PM #5 Newbie   Joined: Oct 2008 Posts: 5 Thanks: 0 Re: solving equation problem I just find out there is a mistake in one number. It can not be solved the way it was posted .
 October 3rd, 2008, 10:57 AM #6 Global Moderator   Joined: Dec 2006 Posts: 19,162 Thanks: 1638 Aren't you going to tell us the correct version?
 October 5th, 2008, 06:41 AM #7 Newbie   Joined: Oct 2008 Posts: 5 Thanks: 0 Re: solving equation problem Nope. No errors. This is the way it was meant to be. I tried every possible way & the answer can't be 64.
 October 5th, 2008, 11:24 AM #8 Senior Member   Joined: Oct 2007 From: Chicago Posts: 1,701 Thanks: 3 Re: solving equation problem So then the given answer is wrong. Anyway, there were no parenthesis to group things? Then the answer is 8*20 - 9 - 5/2^2 = 160 - 9 - 5/4 = 151 - 5/4 = 149 and 3/4 = 599/4 I can't think of any way to regroup it to get 64... I can get 32: 8 * (20-(9-5))/2^2 = 8*(20-4)/4 = 8*16/4 = 8*4 = 32 Am I missing something?
 October 5th, 2008, 07:46 PM #9 Newbie   Joined: Oct 2008 Posts: 5 Thanks: 0 Re: solving equation problem The answer is supposed to be 64 by putting the correct brackets and parenthesis.
 October 10th, 2008, 05:36 AM #10 Newbie   Joined: Oct 2008 Posts: 3 Thanks: 0 Re: solving equation problem GAWD has no one heard of BIMDAS? @_@ the means in which you work out an equation is so if there are no brackets, work out indisies, no indisies, work out multiply, not... you get the idea enjoy

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