Math Problem Statement

f(x)=x23x4f\left(x\right)=x^2-3x-4

Solution

The given function is:

f(x)=x23x4f(x) = x^2 - 3x - 4

This is a quadratic function, and it can be analyzed in several ways.

Key Properties:

  1. Vertex: The vertex of a quadratic function f(x)=ax2+bx+cf(x) = ax^2 + bx + c is given by the formula: xvertex=b2ax_{\text{vertex}} = -\frac{b}{2a} For f(x)=x23x4f(x) = x^2 - 3x - 4, a=1a = 1, b=3b = -3, and c=4c = -4, so the xx-coordinate of the vertex is: xvertex=32(1)=32x_{\text{vertex}} = -\frac{-3}{2(1)} = \frac{3}{2} To find the yy-coordinate of the vertex, substitute x=32x = \frac{3}{2} back into the function: f(32)=(32)23(32)4=94924=254f\left(\frac{3}{2}\right) = \left(\frac{3}{2}\right)^2 - 3\left(\frac{3}{2}\right) - 4 = \frac{9}{4} - \frac{9}{2} - 4 = -\frac{25}{4} Thus, the vertex is (32,254)\left(\frac{3}{2}, -\frac{25}{4}\right).

  2. Axis of Symmetry: The axis of symmetry is the vertical line that passes through the vertex. It is: x=32x = \frac{3}{2}

  3. Y-intercept: The y-intercept occurs when x=0x = 0. Substitute

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Functions
Vertex Form

Formulas

Vertex formula: x_vertex = -b / 2a
Quadratic equation: ax^2 + bx + c

Theorems

Symmetry of quadratic functions
Vertex theorem

Suitable Grade Level

Grades 9-11