the equation was

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

and it bacame

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

Why? and How?

the equation was

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

and it bacame

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

Why? and How?

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Read it phonically!

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.

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.

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## Comments

Just as a disclaimer: I have never actually seen a calculator do this before and so this is simply an educated hypothesis, albeit one that is grounded in the evidence, and must be taken as such. Still, the more important part is that the second equation displayed by your calculator is identitical to the input equation and will still lead to the same answer if you know how to read it.