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Topic: [ap-calculus] Need help plaease on 2008 BC MC # 17
Replies: 1   Last Post: Sep 20, 2012 10:34 PM

 Jamie R. Buchanan Posts: 52 Registered: 11/20/09
RE:[ap-calculus] Need help plaease on 2008 BC MC # 17
Posted: Sep 20, 2012 10:34 PM

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It looks to me like they must mean h of (x^2-3) not h times (x^2-3). It looks like it must be a composition where you are using the chain rule rather than a product.

Jamie Buchanan

________________________________________
From: Qayumi, Enayat [eqayumi@tusd.net]
Sent: Thursday, September 20, 2012 1:18 PM
To: AP Calculus
Subject: [ap-calculus] Need help plaease on 2008 BC MC # 17

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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
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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.

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