Math Problem Statement

Suppose that a function f is differentiable at x = 2 and lim (x→2) (x^3 f(x) - 24) / (x - 2) = 28. Find f(2) and f'(2).

Solution

We are given that the function ff is differentiable at x=2x = 2, and the following limit equation holds:

limx2x3f(x)24x2=28\lim_{x \to 2} \frac{x^3 f(x) - 24}{x - 2} = 28

We need to find f(2)f(2) and f(2)f'(2).

Step 1: Analyze the limit

The given limit resembles the definition of a derivative, but with an additional term x3x^3. Let's try to isolate f(x)f(x).

Rewriting the expression:

limx2x3f(x)24x2=28\lim_{x \to 2} \frac{x^3 f(x) - 24}{x - 2} = 28

We can substitute f(x)f(x) with an expression involving f(2)f(2) to approach the problem more clearly.

Step 2: Break down the equation

We aim to express the equation such that the terms involving f(x)f(x) can be related to f(2)f(2). Since we need f(2)f(2) and f(2)f'(2), let's consider plugging x=2x = 2 into the function and the derivative definition.

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Math Problem Analysis

Mathematical Concepts

Limits
Derivatives
Differentiability

Formulas

Derivative definition lim (h→0) (f(x+h) - f(x)) / h
Limit evaluation

Theorems

Differentiability implies continuity
Definition of derivative

Suitable Grade Level

Grades 11-12 or introductory college calculus