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-1/2x^2-2x+5

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Please help me understand better what the equation is.  Am I supposed to interpret the above as
 
(-½)(x2) - (2x + 5)?
 
(-1/2x2) - 2x + 5?
 
[-1/(2x2 - 2x + 5)]?
 
Without parentheses the equation is meaningless.