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: 39

Answer

$$ f^{\prime \prime}(x)=4+6 x+24 x^{2} ,\quad f(0)=3 ,\quad f(1)=10 $$ The required function is $$ f(x)=2x^{2} + x^{3}+2x^{4}+2x+3 $$

Work Step by Step

$$ f^{\prime \prime}(x)=4+6 x+24 x^{2} ,\quad f(0)=3 ,\quad f(1)=10 $$ The general anti-derivative of $ f^{\prime \prime}(x)=4+6 x+24 x^{2} $ is $$ f^{\prime}(x)=4x +3 x^{2}+8x^{3}+C $$ Using the anti-differentiation rules once more, we find that: $$ f(x)=2x^{2} + x^{3}+2x^{4}+Cx+D $$ To determine D, C we use the fact that $f(0)=3, f(1)=10 $: $$ f((0))=2(0)^{2} + (0)^{3}+2(0)^{4}+C(0)+D=3 $$ $ \Rightarrow $ $$ 0+D=3\quad \Rightarrow \quad D=3, $$ so $$ f(x)=2x^{2} + x^{3}+2x^{4}+Cx+3 $$ and $$ f(1)=2(1)^{2} + (1)^{3}+2(1)^{4}+C(1)+3=10 $$ $ \Rightarrow $ $$ 8+C=10 \quad \Rightarrow \quad C=2, $$ so the required function is $$ f(x)=2x^{2} + x^{3}+2x^{4}+2x+3 $$
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