My Math Forum  

Go Back   My Math Forum > High School Math Forum > Algebra

Algebra Pre-Algebra and Basic Algebra Math Forum


Reply
 
LinkBack Thread Tools Display Modes
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
CAMILLE is offline  
 
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.


Following the rules, we see that you must first deal with radical (rule [color=#008040]3.[/color]) .
Then we do with multiplication and division: and we leave fraction as is . 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.
courteous is offline  
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.
CAMILLE is offline  
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.
Dave is offline  
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 .
CAMILLE is offline  
October 3rd, 2008, 10:57 AM   #6
Global Moderator
 
Joined: Dec 2006

Posts: 17,739
Thanks: 1361

Aren't you going to tell us the correct version?
skipjack is offline  
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.
CAMILLE is offline  
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?
cknapp is offline  
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.
CAMILLE is offline  
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 <brackets><indisies><multiply><divide><add><subtra ct>
so if there are no brackets, work out indisies, no indisies, work out multiply, not... you get the idea
enjoy
f is for philip is offline  
Reply

  My Math Forum > High School Math Forum > Algebra

Tags
equation, problem, solving



Search tags for this page
Click on a term to search for related topics.
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
solving an easy equation problem >_< DannyChu Algebra 3 January 28th, 2013 01:58 PM
Help solving real world equation problem rlrhett Elementary Math 1 April 10th, 2012 06:52 AM
solving equation problem u_r_b_a_n Algebra 1 September 30th, 2008 01:51 AM
Problem solving an equation yaDDy Abstract Algebra 6 July 24th, 2008 12:22 PM
solving an easy equation problem >_< DannyChu Number Theory 1 December 31st, 1969 04:00 PM





Copyright © 2017 My Math Forum. All rights reserved.