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If x^1/2 = 3, what is the value of x^2?

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If x^1/2 = 3, what is the value of x^2?  [#permalink]

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New post 15 Sep 2018, 11:09
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If \(x^\frac{1}{2}\) = 3, what is the value of \(x^2\)?

(A) 1/3
(B) 6
(C) 9
(D) 12
(E) 81

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Re: If x^1/2 = 3, what is the value of x^2?  [#permalink]

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New post 15 Sep 2018, 11:24
SajjadAhmad wrote:
If \(x^\frac{1}{2}\) = 3, what is the value of \(x^2\)?

(A) 1/3
(B) 6
(C) 9
(D) 12
(E) 81

\(\sqrt{x} = 3\)

So, \(x = 9\)

And, \(x^2 = 81\), Answer must be (E)
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Re: If x^1/2 = 3, what is the value of x^2?  [#permalink]

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New post 15 Sep 2018, 18:13
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SajjadAhmad wrote:
If \(x^\frac{1}{2}\) = 3, what is the value of \(x^2\)?

(A) 1/3
(B) 6
(C) 9
(D) 12
(E) 81


\(x^\frac{1}{2}\) = 3

Square both sides.

\(x^(\frac{1}{2})(2)\) = \(3^2\)

x = 9

\(x^2\) = \(9^2\)

\(x^2\) = 81
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Re: If x^1/2 = 3, what is the value of x^2?   [#permalink] 15 Sep 2018, 18:13
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