2. 外语
  3. 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?

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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=y2 + 2
E、x=y2-2
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=x2 + 2. To find x in terms of y, solve the equation y=x2 + 2 for x. First, subtract 2 from both sides to get x2=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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