Math Problem Statement

Which statement is true about the functions A: g(x) = -3/2x + 4, B: f(x) = (x + 2)(x + 6), and the graph C?

Solution

Let's analyze the given functions and statements:

  1. Function A: g(x)=32x+4g(x) = -\frac{3}{2}x + 4
    This is a linear function. Linear functions do not have maxima or minima, since they extend infinitely in both directions.

  2. Function B: f(x)=(x+2)(x+6)f(x) = (x + 2)(x + 6)
    Expanding this function:
    f(x)=x2+8x+12f(x) = x^2 + 8x + 12
    This is a quadratic function with a parabola opening upwards (since the coefficient of x2x^2 is positive). Therefore, it has a minimum point.

  3. Graph C:
    The graph in C is a parabola opening downwards, indicating that it has a maximum point.

Now, let's evaluate the statements:

  1. C has a maximum and A has a minimum.
    This is false because A (linear function) does not have a minimum.

  2. B has a minimum and C has a maximum.
    This is true because B (quadratic) has a minimum and C has a maximum.

  3. B and C have the same zeros.
    To check the zeros of B, we solve:
    (x+2)(x+6)=0    x=2,x=6(x + 2)(x + 6) = 0 \implies x = -2, \, x = -6
    For C, looking at the graph, the zeros seem different from B's. So, this statement is false.

  4. A and B have the same y-intercept.
    The y-intercept of g(x)g(x) is at (0,4)(0, 4).
    The y-intercept of f(x)f(x) is at (0,(0+2)(0+6))=12(0, (0 + 2)(0 + 6)) = 12.
    They are different, so this statement is false.

The correct statement is:
"B has a minimum and C has a maximum."

Do you want a deeper explanation or have further questions?

Related Questions:

  1. How do you find the vertex of a quadratic function?
  2. What is the general method to find the zeros of a polynomial?
  3. How do you determine if a parabola opens upwards or downwards?
  4. What are the characteristics of linear functions compared to quadratic functions?
  5. How do you identify the y-intercept of a function graphically and algebraically?

Tip: Always check the direction of the parabola to determine if it has a maximum or minimum point.

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Math Problem Analysis

Mathematical Concepts

Linear Functions
Quadratic Functions
Maxima and Minima
Zeros of Functions

Formulas

Linear function formula: y = mx + b
Quadratic function expansion: (x + a)(x + b) = x^2 + (a + b)x + ab

Theorems

Maxima and minima of quadratic functions
Zero-product property for solving quadratic equations

Suitable Grade Level

Grades 9-12