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