Math Problem Statement

What is the domain D of the function f(x) = sqrt((3-x)(x+2)) + log_(x+3) |x|?

Solution

To solve this question about the domain of the given function f(x)=(3x)(x+2)+logx+3xf(x) = \sqrt{(3-x)(x+2)} + \log_{x+3} |x|, let us analyze each component:

  1. Square Root Term (3x)(x+2)\sqrt{(3-x)(x+2)}:

    • The expression inside the square root must be non-negative: (3x)(x+2)0(3-x)(x+2) \geq 0.
    • Solve (3x)(x+2)0(3-x)(x+2) \geq 0 using critical points x=3x = 3 and x=2x = -2, and test intervals.
  2. Logarithm Term logx+3x\log_{x+3} |x|:

    • The base of the logarithm x+3x+3 must be positive and not equal to 1: x+3>0x+3 > 0 (i.e., x>3x > -3), and x2x \neq -2.
    • The argument of the logarithm x|x| must also be positive: x0x \neq 0.

Combine these conditions to determine the overall domain DD of the function.

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Math Problem Analysis

Mathematical Concepts

Functions and their domains
Inequalities
Logarithmic expressions

Formulas

Conditions for square roots: expression under the root >= 0
Conditions for logarithms: base > 0, base ≠ 1, argument > 0

Theorems

Properties of square root and domain restrictions
Properties of logarithmic functions and domain

Suitable Grade Level

Grades 11-12