1-3x4+7=?

reply to post by OutKast Searcher


If we did that it wouldn't be joke/mental excersize.
This math problem is more of a joke/troll post than anything else.
It encourages discussion about solving the question. Taht's pretty amusing to watch.

reply to post by grey580


It is amusing to watch...I don't believe it is still going on and still arguing over what the correct answer is.

I'm not a good teacher...I explain things the way they make sense to me...if someone can't get it from that...I'm lost. So I will just sit back and watch

Originally posted by grey580
1-3x4+7=?
Discuss.

1 - (3 x 4) + 7 =

1 - 12 + 7 =

-11 + (+7) = -4

The addition / subtraction gets done in the order written after the multiplication / division gets done.
************

I just went back and read the last 2 pages. that's really frightening. I think a few people need to go back to school.

Originally posted by grey580
1-3x4+7=?
Discuss.

Right answer is simply '0' i can prove you;

the section '-3*4' is complicated. so i want to consider Y=-3*4 and my equation is now:

1+Y+7 = X (i am considering my result as X)
8+Y = X (now i want to consider Y=3*Z)
8+3Z = X
now multiply equation with X:
8X+3ZX = X" (i want to write 'X^2' as X")
subtract Z" (i mean Z^2) from booth sides of equation:
8X+3XZ-Z" = X"-Z"
X(8+3Z)-Z*Z = X"-Z"

i know Y=3*Z and Y=-3*4; so i can calculate Z=-4. i want to put that Z value to two italic one above:

X(8+3(-4))-(-4)*Z = X"-Z"

we all know (X^2 - Y^2) = (X-Y)*(X+Y) now i want to use that at the right side of my current equation above:

X(8-12)+4Z = (X-Z)*(X+Z)
-4*(X-Z) = (X-Z)*(X+Z)
-4 = (X+Z) (and i already know Z=-4)
-4 = X+(-4)
X=0

mission accomplished

reply to post by S.P.Q.R


Wrong answer.

it's -4

addition and subtraction first than multiplication and division 1-3x4+7 (1-3=-2) (4+7=11) -2x11+-22

reply to post by OutKast Searcher


simple arithmatic
addition and subtraction first than multiplication and division 1-3x4+7 (1-3=-2) (4+7=11) -2x11+-22

reply to post by grey580

1-3x4+7=?

Answers we have so far:
-4, -18, -1, -15, -5, -22, 18, 0

Originally posted by snowspirit
reply to post by grey580

 

1-3x4+7=?

Answers we have so far:
-4, -18, -1, -15, -5, -22, 18, 0

LoL yeah.

I wonder why this is so difficult?

One. Minus three times four, plus seven.

How hard can that be to solve?

If you read the sentence out loud you even get a tip on how to solve it.

Originally posted by ^anubis^
reply to post by OutKast Searcher

 

simple arithmatic
addition and subtraction first than multiplication and division 1-3x4+7 (1-3=-2) (4+7=11) -2x11+-22

edit on 14-10-2010 by ^anubis^ because: mispelled

Am I being Punked????

I can't tell if people are joking or not with these wrong answers.

dont believe me? believe google:

original image

reply to post by S.P.Q.R


Nope...everytime I type it into google, excel, windows calculator, SQL....I get -4.


I am pretty sure I'm being Punked...punked by people pretending they have poor math skills...at least I hope that is the case.

I tried with wolframAlpha: www64.wolframalpha.com...

Even it shows -4 as the true answer.

Originally posted by GypsK
okok.... not to mention that my kid is learning this in school as we speak, lol


you think I'm stupid?
do this calculation on a calculator then! (seriously, do it)

And todays show is brought to you by the letter B, for BBBBBBBBOOOOOOOOOOONNNGGG and S for SMOOOKKKKEEE.

Everyone know that 1+1=3 Since you are yourself allready a person, you add 2 more, and there you go you get a threesome mmmmm threesome

Originally posted by OutKast Searcher
reply to post by S.P.Q.R

 

Nope...everytime I type it into google, excel, windows calculator, SQL....I get -4.

I am pretty sure I'm being Punked...punked by people pretending they have poor math skills...at least I hope that is the case.

I would hope so. Math has clear rules that we are taught at an early age. Brackets, Exponents, Division, Multiplication, Addition, Subtraction. BEDMAS . And to go from left to right in order after BEDMAS.

Some people have gone to great lengths to try to show another answer, but it is -4.
I wonder what the math skills are like in the government? I hope it's better, or there's no hope. That small equation showed how many different ways that math can be mangled.

as an answer to everyone who answered me:

Originally posted by S.P.Q.R

Originally posted by grey580
1-3x4+7=?
Discuss.

Right answer is simply '0' i can prove you;

the section '-3*4' is complicated. so i want to consider Y=-3*4 and my equation is now:

1+Y+7 = X (i am considering my result as X)
8+Y = X (now i want to consider Y=3*Z)
8+3Z = X
now multiply equation with X:
8X+3ZX = X" (i want to write 'X^2' as X")
subtract Z" (i mean Z^2) from booth sides of equation:
8X+3XZ-Z" = X"-Z"
X(8+3Z)-Z*Z = X"-Z"

i know Y=3*Z and Y=-3*4; so i can calculate Z=-4. i want to put that Z value to two italic one above:

X(8+3(-4))-(-4)*Z = X"-Z"

we all know (X^2 - Y^2) = (X-Y)*(X+Y) now i want to use that at the right side of my current equation above:

X(8-12)+4Z = (X-Z)*(X+Z)
-4*(X-Z) = (X-Z)*(X+Z)
-4 = (X+Z) (and i already know Z=-4)
-4 = X+(-4)
X=0

mission accomplished

lol all of the answers are right, depending on what the question tells you to do to solve the problem.

Originally posted by ^anubis^
lol all of the answers are right, depending on what the question tells you to do to solve the problem.

I dont agree with you on that.

In this case the equation is set. When you have put in the equality symbol the question is clear.

What does 1 - 3 x 4 + 7 =

1 - 3 x 4 + 7 = -4