Mathematics > Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

First, 3 is subtracted from x and the square root of the difference is taken. Then, 5 is added to the result, giving a final result of 9. What is the value of x?

(A) 3

(B) 4

(C) 5

(D) 16

(E) 19 

正确答案>>>

The correct answer is E

Explanation

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