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SAT数学:代数例题 8

2019-09-12 SAT-数学 阅读

SAT Question
Rank: Easy
Topic: Algebra, Radicals

 

Below is a question from a recent SAT exam. It is a non-calculator question that would typically take a student 1-2 minutes to complete.


If x > 0, which of the following is equivalent to the given expression?
(A)
(B)
(C)
(D)

To answer this question, we must first deal with the square root.
We can work out the individual parts under the square root separately.

We put these together to get . So, we have two possible answers. 3x and-3x.
As x>0 the answer must be 3x.

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