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If x is positive and y is 1 less than the square of x, which

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If x is positive and y is 1 less than the square of x, which [#permalink] New post 15 Jun 2018, 15:19
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If x is positive and y is 1 less than the square of x, which of the following expresses x in terms of y ?

(A) \(x = y^2 - 1\)

(B) \(x = y^2 + 1\)

(C) \(x = \sqrt{y} + 1\)

(D) \(x = \sqrt{1-y}\)

(E) \(x= \sqrt{y+1}\)
[Reveal] Spoiler: OA

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Re: If x is positive and y is 1 less than the square of x, which [#permalink] New post 16 Jun 2018, 06:52
Carcass wrote:
If x is positive and y is 1 less than the square of x, which of the following expresses x in terms of y ?

(A) \(x = y^2 - 1\)

(B) \(x = y^2 + 1\)

(C) \(x = \sqrt{y} + 1\)

(D) \(x = \sqrt{1-y}\)

(E) \(x= \sqrt{y+1}\)


x is +ve, then y = x^2 - 1

then x in terms of y => y + 1 = x^2

=> \(x= \sqrt{y+1}\)


E.
Re: If x is positive and y is 1 less than the square of x, which   [#permalink] 16 Jun 2018, 06:52
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If x is positive and y is 1 less than the square of x, which

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