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# What is the value of x 1) x^2 = 4x 2) x is an even integer

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Manager
Joined: 28 Feb 2003
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What is the value of x 1) x^2 = 4x 2) x is an even integer [#permalink]  14 May 2003, 03:22
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0% (00:00) correct 0% (00:00) wrong based on 1 sessions
What is the value of x

1) x^2 = 4x
2) x is an even integer
Intern
Joined: 07 May 2003
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Ans:A

x^2=4x --> x=+/-(2)sqrt(x) --> sqrt(x)=+/-2 (dividing both sides with sqrt(x)) --> x=4 in both cases ie.sqrt(x)=2 or sqrt(x)=-2
or simply
x^2=4x implies x*x=4x, cancelling x on both sides u get x=4(can we do this way -if yes answer is A)
Manager
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No, it is not C and A.......anybody else want to try
Manager
Joined: 12 Mar 2003
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Slipped on this one. Ans = E

1) x=0 or 4 => Insuff

2) can be any even integer, thus -2, 0, 2, 4, etc => Insuff

Combined : x = 0 or 4 thus Insuff....

Trick : 0 (Zero) is an even integer !
Senior Manager
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[quote="tzolkin Slipped on this one. Ans = E

1) x=0 or 4 => Insuff

2) can be any even integer, thus -2, 0, 2, 4, etc => Insuff

Combined : x = 0 or 4 thus Insuff....

Trick : 0 (Zero) is an even integer ![/quote]

another E
Same explanation that tzolkin
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