Calculus 8th Edition

Published by Cengage
ISBN 10: 1285740629
ISBN 13: 978-1-28574-062-1

Chapter 3 - Applications of Differentiation - 3.9 Antiderivatives - 3.9 Exercises - Page 283: 40

Answer

$$ f^{\prime \prime}(x)=20 x^{3}+12x^{2}+4 ,\quad f(0)=8 ,\quad f(1)=5 $$ The required function is $$ f(x)=x^{5}+x^{4}+2x^{2}-7x+8 $$

Work Step by Step

$$ f^{\prime \prime}(x)=20 x^{3}+12x^{2}+4 ,\quad f(0)=8 ,\quad f(1)=5 $$ The general anti-derivative of $ f^{\prime \prime}(x)=20 x^{3}+12x^{2}+4 $ is $$ f^{\prime}(x)=5x^{4}+4x^{3}+4x+C $$ Using the anti-differentiation rules once more, we find that: $$ f(x)=x^{5}+x^{4}+2x^{2}+Cx+D $$ To determine $ C, D$ we use the fact that $f(0)=8, f(1)=5$: $$ f(0)=(0)^{5}+(0)^{4}+2(0)^{2}+C(0)+D=8 $$ $ \Rightarrow $ $$ 0+D=8 \quad \Rightarrow \quad D=8, $$ and $$ f(1)=(1)^{5}+(1)^{4}+2(1)^{2}+C(1)+8=5 $$ $ \Rightarrow $ $$ 12+C=5 \quad \Rightarrow \quad C=-7, $$ so the required function is $$ f(x)=x^{5}+x^{4}+2x^{2}-7x+8 $$
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