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If x is positive and y is two greater than the square of x, which of the following expresses x in terms of y?
If x is positive and y is two greater than the square of x, which of the following expresses x in terms of y?
admin
2013-05-19
45
问题
If x is positive and y is two greater than the square of x, which of the following expresses x in terms of y?
选项
A、x=
B、x=
C、x=
D、x=y
2
+ 2
E、x=y
2
-2
答案
B
解析
The correct answer is B. When x is positive and y is two greater than the square of x, y=x
2
+ 2. To find x in terms of y, solve the equation y=x
2
+ 2 for x. First, subtract 2 from both sides to get x
2
=y-2. Then take the square root of both sides such that y-2 is thought of as a single quantity: x =
.
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GRE QUANTITATIVE题库GRE分类
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GRE QUANTITATIVE
GRE
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