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SAT I 一日一问：2013年2月16日

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The Correct answer is E.

Explanation

When is subtracted from , the result is x minus 3 . The square root of this difference is square root (x minus 3) . When is added to , the final result is . This can be written as (square root (x minus 3)) plus 5 = 9 . Subtracting from both sides gives the equation square root (x minus 3) = 4 . Squaring both sides of this equation gives x minus 3 = 16 , or x = 19 .