Factoring : GMAT Problem Solving (PS)
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# Factoring

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Manager
Joined: 24 May 2010
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12 Jul 2010, 17:53
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Hi All,

I know this is a easy one but I didnt understand how my MA book did this factoring. Can someone please show me step by step.

7*x+4-(7*y+5)

this step i dont get

7*(x-y)-1

and then
7(x-y-1)+7-1

Thanks
Manager
Joined: 16 Apr 2010
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12 Jul 2010, 20:06
Hi,

7x + 4 - (7y + 5) = 7x + 4 - 7y - 5
= 7x - 7y - 1
= 7x - 7y - 1 - 7 + 7
= (7x - 7y - 7) + 7 - 1
= 7(x - y - 1) + 7 - 1

Hope it is clear to you now.

regards,
Jack
Re: Factoring   [#permalink] 12 Jul 2010, 20:06
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