Lösung 1.1:2e
Aus Online Mathematik Brückenkurs 2
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Version vom 09:59, 11. Mär. 2009
We expand the quadratic expression as
| \displaystyle \begin{align}
f(x) &= \bigl(x^2-1\bigr)^2\\[5pt] &= \bigl(x^2\bigr)^2 - 2\cdot x^2\cdot 1 + 1^2\\[5pt] &= x^4 - 2x^2 + 1\,\textrm{.} \end{align} |
When the function is written in this form, it is easy to differentiate term by term,
| \displaystyle \begin{align}
f^{\,\prime}(x) &= \frac{d}{dx}\,\bigl(x^4-2x^2+1\bigr)\\[5pt] &= \frac{d}{dx}\,x^4 - 2\frac{d}{dx}\,x^2 + \frac{d}{dx}\,1\\[5pt] &= 4\cdot x^{4-1} - 2\cdot 2x^{2-1} + 0\\[5pt] &= 4x^{3} - 4x\\[5pt] &= 4x(x^2-1)\,\textrm{.} \end{align} |
