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Joined: 06 Jan 2013
Posts: 5
Given Kudos: 30
Is h^2 = h ? (1) h + h = h (2) h – h = h
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04 May 2013, 01:50
04 May 2013, 01:50
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Re: Is h^2 = h ? (1) h + h = h (2) h – h = h
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04 May 2013, 01:53
04 May 2013, 01:53
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Is h^2 = h ?
The question is: is \(h=0\) or \(h=1\)?
(1) h + h = h
So \(h=0\) Sufficient
(2) h – h = h
So \(-h=0\) , \(h=0\) Sufficient
D
The question is: is \(h=0\) or \(h=1\)?
(1) h + h = h
So \(h=0\) Sufficient
(2) h – h = h
So \(-h=0\) , \(h=0\) Sufficient
D
General Discussion
Re: Is h^2 = h ? (1) h + h = h (2) h – h = h
[#permalink]
04 May 2013, 07:10
04 May 2013, 07:10
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Expert Reply
Is h^2 = h ?
Is \(h^2 = h\)? --> is \(h^2 - h =0\)? --> is \(h(h-1)=0\)? --> is \(h=0\) or \(h=1\)?
(1) h + h = h --> 2h=h --> h=0. Sufficient.
(2) h – h = h --> 0=h. Sufficient.
Answer: D.
Hope it's clear.
Is \(h^2 = h\)? --> is \(h^2 - h =0\)? --> is \(h(h-1)=0\)? --> is \(h=0\) or \(h=1\)?
(1) h + h = h --> 2h=h --> h=0. Sufficient.
(2) h – h = h --> 0=h. Sufficient.
Answer: D.
Hope it's clear.
