Which equation results from taking the square root of both sides of open paren x minus 9 close paren squared is equal to 81 ?

Taking the square root of both sides of (x − 9)² = 81 gives x − 9 = ±√81. Since √81 = 9 and the squared expression can come from either a positive or negative value, the result is x − 9 = ±9, choice D.

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