The equation is the integral of (x^3)(sqrt(1+x^2). The steps say that u=(1/2)x^2, where do they get that from?

Functions and Change: A Modeling Approach to College Algebra (MindTap Course List)
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ISBN:9781337111348
Author:Bruce Crauder, Benny Evans, Alan Noell
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Chapter2: Graphical And Tabular Analysis
Section2.1: Tables And Trends
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The equation is the integral of (x^3)(sqrt(1+x^2). The steps say that u=(1/2)x^2, where do they get that from?

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