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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]  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]  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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