Math Problem Statement

求y=3x**2 + 9x的极小值

Solution

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Math Problem Analysis

Mathematical Concepts

Quadratic Functions
Derivatives
Critical Points
Second Derivative Test

Formulas

Quadratic function: y = ax^2 + bx + c
Derivative: f'(x)
Second derivative: f''(x)

Theorems

Second Derivative Test

Suitable Grade Level

Advanced High School