Derivatives

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apple77: Newbie | Next Rank: 10 Posts; Posts: 1; Joined: Sun Feb 15, 2009 9:06 pm

by apple77 » Sun Feb 15, 2009 9:38 pm

Hi,

How can I convert this equation: Q=7.489 * P^-1.27
into Q/P = ?

this is not exponent but derivatives rule...

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Source: Beat The GMAT — Problem Solving | Sun Feb 15, 2009 9:38 pm

Stuart@KaplanGMAT: GMAT Instructor; Posts: 3225; Joined: Tue Jan 08, 2008 2:40 pmFollowed by: 614 members; Location: Toronto; Thanked: 1710 times; GMAT Score:800

by Stuart@KaplanGMAT » Mon Feb 16, 2009 1:14 am

There's no calculus on the GMAT, you'll never need to use derivatives.

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Ian Stewart: GMAT Instructor; Posts: 2623; Joined: Mon Jun 02, 2008 3:17 amFollowed by: 355 members; Location: Montreal; Thanked: 1090 times; GMAT Score:780

Re: Derivatives

by Ian Stewart » Mon Feb 16, 2009 7:13 am

As Stuart says, there's no calculus on the GMAT, so this is for interest only - GMAT test takers can ignore the following!

The derivative of c*x^m is c*m*x^(m-1). So if y = 7.489*x^(-1.27), then dy/dx = 7.489*(-1.27)*x^(-2.27).

apple77 wrote:Hi,

How can I convert this equation: Q=7.489 * P^-1.27
into Q/P = ?

this is not exponent but derivatives rule...

For online GMAT math tutoring, or to buy my higher-level Quant books and problem sets, contact me at ianstewartgmat at gmail.com

ianstewartgmat.com

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