The question is what do you refer to as built-in  functions ?
However - there are two work-arounds with no need for VBA code.
1) While the "+2+2" was typed in cell A1 > select cell B1 > press CTRL+F3 >
define the name EVALUATION and refer it to:
=EVALUATE(A1)
In cell B1 type EVALUATION [with no argument and/or parentheses !!!
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2) Download and activate the add-in MOREFUNC.
In B1 Type: =EVAL(A1) Function
http://download.cnet.com/Morefunc/3000-2077_4-10423159.html
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The MOREFUNC add-in has a lot of more handy and useful functions.
Micky
	
		
			
				Faraz A. Qureshi said:
			
		
	
	
		
		
			I see!
That means a formula type string can't be evaluated with built-in functions?