Simplify the expression

How do you simplify -[4 - (3 - 7)²] ?

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-{4 - (3 - 7)²]
= -[4 - (-4)²]   {subtracted 3 - 7}
= -[4 - 16]  {squared the -4}
= -[-12]  {subtracted 4 - 16}
= 12  {distributed negative sign}

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