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7-3*2+1=2? how is that, isn't it 0 (zero)?

Guest Apr 3, 2017
 #1
avatar+451 
+1

It's 2. You use order of operations for this one. 

Multiplication comes before Addition and Subtraction. 

 

7-3*2+1

7-6+1

1+1

=2

Neptune  Apr 3, 2017
 #2
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Yes exactly I mean that, "order of operations". (+) is must before (-) right? 1 (*), 2 (+), 3 (-). First 3*2, next 6+1, then 7-7.

Guest Apr 3, 2017
 #3
avatar+11 
+2

Okay so if the problem has multiplication you do that first. 

Your problem is 7-3*2+1=2

so 3*2=6 and then you will have 7-6+1=2, then you subtract 7 from 6 and get 1, and finally add 1 + 1 and you get the answer 2.

Terriann  Apr 3, 2017
 #4
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+1

(7) + (-6) + (1)

or 

7 - (6 - 1)

or

7 + 1 - 6

You neglected the negative sign by making it 7-7.  You're not adding 1 to 6, you're supposed to add 1 to -6.

 

For addition/subraction, there is no order since you're doing the exact same thing.  1 + 1 can be said as 1 - (-1).  Both will be 2.  Same goes with multiplication and division.  Doesn't matter which of the two goes first, as long as multiplication/division goes before addition/subtraction.

Guest Apr 3, 2017
edited by Guest  Apr 3, 2017
edited by Guest  Apr 3, 2017
 #5
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+1

Ok thanks, its illuminating...

Guest Apr 3, 2017

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