Proof

(related to Corollary: Derivative of a Linear Function \(ax+b\))

To calculate the derivative of a linear function \(f(x)=ax +b\), \(a,b\in\mathbb R\) we can apply the basic arithmetic operations involving derivatives and conclude

\[f'(x)=(ax +b)'=(ax)' +(b)'=a+0=a.\]

Herein, we have applied the rule \((1)\), the rule \((3)\), and the rule of a derivative of a constant function.


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References

Bibliography

  1. Forster Otto: "Analysis 1, Differential- und Integralrechnung einer Veränderlichen", Vieweg Studium, 1983