Higgins George
07/13/2023 · Middle School
3.1. State the definition of a derivative of a function \( f(x) \). 3.2. Show that if \( f(x) \) is differentiable at \( x=a \), then \( f(x) \) is continuous at \( x=a \). 3.3. Let \( f(x)=\left\{\begin{array}{c}x+3, x<1 \\ (x+1)^{2}, x \geq 1\end{array}\right. \), and use the first principles to determine whether \( f(x) \) is differentiable at \( x=1 \).
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The derivative of \( f(x) \) at \( x = a \) is defined as \( f'(a) = \lim_{h \to 0} \frac{f(a + h) - f(a)}{h} \). If \( f(x) \) is differentiable at \( x = a \), it is also continuous at \( x = a \). For the function \( f(x) = \left\{\begin{array}{c}x+3, x<1 \\ (x+1)^{2}, x \geq 1\end{array}\right. \), \( f(x) \) is not differentiable at \( x = 1 \) because the left-hand and right-hand derivatives at \( x = 1 \) are not equal.
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