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What is the value of x?

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Source: — Data Sufficiency |
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Re: What is the value of x?

by deloitte247 » Fri Nov 20, 2020 5:28 pm
Statement 1: |x| = 4
The absolute value of x is 4.
$$Hence,\ \pm x=4$$
So, x = 4 or -x = 4
x = 4 or x = -4
The value of x is not definite here. Therefore, statement 1 is NOT SUFFICIENT.
$$Statement\ 2:\ x^2=16$$
$$\pm\sqrt{x}=\sqrt{16}$$
$$\pm x=4$$
$$x=4\ or\ -x=4$$
$$x=4\ or\ x=-4$$
The value of x is not definite, hence, statement 2 is NOT SUFFICIENT.

Combining both statements:
The result of the expression in both statements are the same. Hence, no new information is obtained when the two statements are combined. Therefore, both statements combined together are not SUFFICIENT.

ANSWER = Option E
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Re: What is the value of x?

by swerve » Sat Nov 21, 2020 11:40 am
BTGmoderatorDC wrote: ↑
Fri Nov 13, 2020 9:11 pm
 What is the value of x?

(1) |x| = 4.

(2) x^2 = 16.


OA E

Source: Princeton Review
From statement 1, the value of \(x\) can be \(+4\) or \(-4\). No Sufficient \(\Large{\color{red}\chi}\)

From statement 2, the value of \(x\) can be \(+4\) or \(-4\) as \(4^2=16\) and \((-4)^2=16\) No Sufficient \(\Large{\color{red}\chi}\)

Therefore, E
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