



 
Hi Andrea, I wouldn't mix arithmetic expressions like 4 with english words like squared. There are certain conventions in evaluating arithmetical expressions that remove the ambiguity caused by 4 squared. In evaluating arithmetic expressions, exponentiation (powers) are performed before multiplication or addition. Thus for 4^{2} you should evaluate 4^{2} first to obtain 16 and then multiply by 1 to get
Parentheses in mathematical expressions are used as commas are sometimes used in english, to group objects together. Hence in (4)^{2} the exponent is applied to the entire expression 4. Hence
I hope this helps,  


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