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Giordano, Patricia

Posts: 2
Registered: 9/21/12

RE:[ap-calculus] ap-calculus digest: September 20, 2012
Posted: Sep 21, 2012 7:37 AM

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Chain rule?

-----Original Message-----
From: AP Calculus digest [mailto:ap-calculus@lyris.collegeboard.com]
Sent: Friday, September 21, 2012 3:00 AM
To: ap-calculus digest recipients
Subject: ap-calculus digest: September 20, 2012

NOTE:
This ap-calculus EDG will be closing in the next few weeks. Please sign up for the new AP Calculus Teacher Community Forum at https://apcommunity.collegeboard.org/getting-started
and post messages there.
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AP-CALCULUS Digest for Thursday, September 20, 2012.

1. Need help plaease on 2008 BC MC # 17

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Subject: Need help plaease on 2008 BC MC # 17
From: "Qayumi, Enayat" <eqayumi@tusd.net>
Date: Thu, 20 Sep 2012 17:18:03 +0000
X-Message-Number: 1

If h is a differentiable function and f(x) = h (x^2 - 3)

Why is the f'(x) = 2x h'(x^2-3) which will give the correct answer once you plug in x = 2

And Not

f'(x) = h' (x^2 - 3) + h (2x) due to the product rule? Once you find f'(2) = h' + 4h, it is not one of the MC options.

What am I missing? Thank you in advance for your response.

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