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Stuck on Kaplan Maths WB 6th Edition - Algebra Question P125

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Stuck on Kaplan Maths WB 6th Edition - Algebra Question P125 [#permalink]

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New post 23 Jan 2010, 08:09
I've been trying to unravel the Kaplan answer provided without success. Hope someone can guide me to how they arrive at it!

mn - 3 = 3-n

n+mn - 3 = 3 - n + n Got it!

mn + n - 3 = 3 Got it!

mn + n = 6 Got it!

n(m+1) = 6 huh?!

Question is how did it get from mn + n to n(m+1)? I've lost the train of logic

Thanks

Swash

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Re: Stuck on Kaplan Maths WB 6th Edition - Algebra Question P125 [#permalink]

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New post 23 Jan 2010, 08:28
doh! So dumb

Plugged in some numbers to test it out and worked it out!

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Re: Stuck on Kaplan Maths WB 6th Edition - Algebra Question P125 [#permalink]

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New post 26 Jan 2010, 10:14
swashbuckler :: Please go through the basics of mathematics, commulative ,associative properties.

mn+ n
take n common.. u will get n(m + 1)

If you break the bracket you will get n(m+1) = n(m) + n(1) = nm +1
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Re: Stuck on Kaplan Maths WB 6th Edition - Algebra Question P125 [#permalink]

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New post 26 Jan 2010, 20:18
Hi swashbuckler,

This function, known as "factoring", is a key concept to algebra on the GMAT--make sure you spend time with it.

The general rule, known as the distributive property (I think? I'm so bad with names!), is that a(b + c) = a x b + a x c

Keep working through our math workbook--this property may not be covered in detail (I'm not familiar with the specific text) but the rules used will be tested again and again. Once you've learned to go both ways--multiplying both terms inside parentheses by a factor, or pulling a common factor of two terms out of parentheses--you'll have mastered a powerful tool for taking on GMAT mathematics.
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Re: Stuck on Kaplan Maths WB 6th Edition - Algebra Question P125 [#permalink]

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New post 28 Jan 2010, 01:37
Thanks guys for the replies. Just to drill down to one of the answers, when we say "take n as common" do we mean n as the common factor of -6 in the question stem above? Which is -3 or 3

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Re: Stuck on Kaplan Maths WB 6th Edition - Algebra Question P125 [#permalink]

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New post 16 Oct 2017, 01:39
Take "n" as common from "nm+n" which will result in n (m+1)

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Re: Stuck on Kaplan Maths WB 6th Edition - Algebra Question P125   [#permalink] 16 Oct 2017, 01:39
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Stuck on Kaplan Maths WB 6th Edition - Algebra Question P125

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