WW needs math help please

[kai2k1 0]

How do you arrive at the answer for this equation? Can you explain it to us step by step?


7squared - {18-[40/(4times2) + 2] +5squared}

Thanks for all the help.

There's no truer sense of flying than sky diving," Scott Cowan

[jumpinfarmer 0]

I can't think that much anymore it makes my brain hurt.

[bob.dino 0]

In general, solve from the inside out:

x = 7^2 - (18 - (40 / (4 * 2) + 2) + 5^2)

x = 7^2 - (18 - (40 / 8 + 2) + 5^2)

x = 7^2 - (18 - (5 + 2) + 5^2)		-- division is of higher precedence than addition

x = 7^2 - (18 - 7)  + 5^2

x = 49 - 11 + 25

x = 63

Note: this may contain errors. Use at your own risk.

[pleifer 0]

Quote

How do you arrive at the answer for this equation? Can you explain it to us step by step?


7squared - {18-[40/(4times2) + 2] +5squared}

Thanks for all the help.

start from the inside parenthasis first so

7squared - {18-[40/8 + 2] +5squared}

then order of opperations says devide first so
7squared - {18-[5 + 2] +5squared}
then add 2
7squared - {18-7 +5squared}

now you have order of opperations
49 - {18-7 +25}

and add from there

49 - {18-7 +25}= 49- 36= 13

_________________________________________
The Angel of Duh has spoke

[quade 3]

Depends on the -exact- rules for precedence you're following.

For instance, if you are in Microsoft Excel and ask it what the order is you'll get the following;

Quote

If you combine several operators in a single formula, Microsoft Excel performs the operations in the order shown in the following table. If a formula contains operators with the same precedence -- for example, if a formula contains both a multiplication and division operator -- Microsoft Excel evaluates the operators from left to right. To change the order of evaluation, enclose the part of the formula to be calculated first in parentheses. For more information about calculation operators, click .

and

Quote

Operator Description
: (colon)
, (comma)
(single space)
Reference operators
- Negation (as in -1)
% Percent
^ Exponentiation
* and / Multiplication and division
+ and - Addition and subtraction
& Connects two strings of text (concatenation)
= < > <= >= <> Comparison

So in Excel the answer would be;

4*2 = 8

40/8 = 5

5+2 = 7

18-7 = 11

11+5^2 = 36

7^2 - 36 = 13

So the answer would be 13 according to their rules.

quade -
The World's Most Boring Skydiver

[pleifer 0]

the 5^2 needs to stay in the parenthasis....

that is why the answers don't match up

_________________________________________
The Angel of Duh has spoke

[Nightingale 0]

simplify inside parentheses, and do exponents...

7squared -{18-[40/(4x2) + 2] + 5squared}

49 -{18-[40/(8)+2)] +25}
49-{18-[5+2] + 25}
49-{18-7+25}
49-{11+25}
49-{36}
13

[pleifer 0]

it is 13 according to the rules of mathmatics too

_________________________________________
The Angel of Duh has spoke

[quade 3]

I guess you've never worked in an environment that evaluated equations differently. It does happen. Although I will admit that with the ubiquity of certain programs, Excel among them, most people evaluate things the same way these days.

quade -
The World's Most Boring Skydiver

[pleifer 0]

Quote

simplify inside parentheses, and do exponents...

7squared -{18-[40/(4x2) + 2] + 5squared}

49 -{18-[40/(8+2)] +25}
49-{18-[40/10] + 25}
49-{18-4+25}
49-{14+25}
49-{39}
10

aaaaaahhhhhhhhhhh!!!!!!!!!!!
rules of operations people
ok!
7squared -{18-[40/(4x2) + 2] + 5squared}
4*2= 8 then 40/8= 5 then add the 2 is the correct order of opperations

that is why it's 13 not 10

_________________________________________
The Angel of Duh has spoke

[pleifer 0]

Quote

I guess you've never worked in an environment that evaluated equations differently. It does happen. Although I will admit that with the ubiquity of certain programs, Excel among them, most people evaluate things the same way these days.

Nope I have never worked for NASA

plug it correctly into any scientific calculator and for this problem we'll get 13.... unique computer programs are a totaly diffrent story

_________________________________________
The Angel of Duh has spoke

[Nightingale 0]

the way I read it first, I thought the +2 was part of what you were supposed to divide by. I re-read it again, and discovered my error... misread the question.

[shmali 0]

13 and here's the breakdown.

Math always works from in to out deapest grouping's (){}[] out. so then we start with (4times2) = 8

next we calculate [40/8 + 2], rule of them here is to do divison/multiplication before addition/subtraction.

so we get 40/8 = 5, and 5+2 = 7

ok now we have 7squared =49, 5squared =25 so
49 - {18 - [7] +25}

inside the {} is simple add subtract 18-7+25 = 36

and then you are left with 49 - 36 = 13

There's you answer and step by step explanation.

We can discuss my consoltation fee later



edited to add
so many answer so quickly, who'd have thunk it

Pineappe Death Juice, If you have to ask you'd rather not know!

[kai2k1 0]

This is the WW.

Thank you everyone for your help. I am trying to take a review math class for college and am having a difficult time after not doing these kind of problems for so many (many, many) years.

There's no truer sense of flying than sky diving," Scott Cowan

[WrongWay 0]

My head hurts just looking at this stuff.......ack..........

Wrong Way
D #27371 Mal Manera Rodriguez Cajun Chicken Ø Hellfish #451
The wiser wolf prevails.

[bob.dino 0]

Told ya there might be errors. Friday lunchtime beers are a killer

[lewmonst 0]

PEMDAS.

That is the only rule. Follow it.

P - do everything inside parenthesis first (still following EMDAS in the ()...)
E - Exponents. Do exponents before multiplying, dividing, adding or subtracting.
MD - Multiply and divide from left to right.
AS - Add and Subtract from left to right.

Please Excuse My Dear Aunt Sally.

peace
lew

http://www.exitshot.com