In the course of proving the Constant Multiple Rule

MATHEMATICS · Subjective · AP · Calculus AB · Limits and Continuity · Limits and Continuity

Problem

In the course of proving the Constant Multiple Rule, a student writes F′(x)=lim⁡h→0c f(x+h)−c f(x)h(1)F'(x)=\displaystyle\lim_{h\to0}\frac{c\,f(x+h)-c\,f(x)}{h}\quad\text{(1)} =clim⁡h→0f(x+h)−f(x)h(2)=\displaystyle c\lim_{h\to0}\frac{f(x+h)-f(x)}{h}\quad\text{(2)} Which property of limits justifies the transition from step (1) to step (2)? State this property.

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