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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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15 Sep 2018, 11:09
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Difficulty:

15% (low)

Question Stats:

84% (00:37) correct 16% (00:30) wrong based on 34 sessions

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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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15 Sep 2018, 11:24
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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15 Sep 2018, 18:13
1
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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