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# I just used your equation calculator and now I am more confused there were additional "+" signs and I don't k=know how they got there. Please help.

the equation was

3+2[10(7*5-30)-40]

and it bacame

3+2[10(35+ -30)+ -40]

Why? and How?

### 4 Answers by Expert Tutors

Thomas D. | K-12 Minneapolis Public School Tutor, also Sub at Orthodox Jewish EleK-12 Minneapolis Public School Tutor, al...
4.4 4.4 (11 lesson ratings) (11)
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3+2[10(35+ -30)+ -40]

three plus two "OPEN SQUARE BRACKET" times ten "OPEN PARENTHESES BRACKET" thirty five plus negative thirty "CLOSE PARENTHESES BRACKET" plus negative 40 "CLOSE SQUARE BRACKET"

This often helps, I have the student read me what they think it says, then have them space by space read me what they are seeing, and directing on minus versus negative etc.

Jinjer M. | Math and Science Tutor for Active or Artistic StudentsMath and Science Tutor for Active or Art...
4.9 4.9 (106 lesson ratings) (106)
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Subtraction can always be thought of as adding a negative number.

For example,   1 - 1      is the same as          1+ -1.

I love that your calculator shows this! It looks weird at first, but if you get used to thinking of "subtracting" as "adding a negative number", it will help you as you get into more advanced algebra.

William N. | Former Kumon Tutor Specializing in Englsh, Math, SAT, and PSAT Former Kumon Tutor Specializing in Engls...
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