>>you say
>>
>>?5-2^2
>>
>>different than
>>
>>?-2^2+5
>>
>>that can't acceptable...
>
>Metin - those are not equivalent expressions. You are confusing subtraction with negation... while they are somewhat interchangeable it isn't "commutative"
>
>5 - 2 = -2 + 5
>
>5 - 2^2 = -(2^2) + 5

just ask that your son's math. teacher. you can change things (-,+) order in math.