Math Problem Statement

g(x) = 3|x + 4| − 2. Which statement is correct? The function f (x) has the same range as g(x). The function f (x) has the same vertex as g(x). The function f (x) has the same x-intercept as g(x). The function f (x) has the same y-intercept as g(x).

Solution

Let's break down the given function g(x)=3x+42g(x) = 3|x + 4| - 2 and evaluate the potential comparisons to a function f(x)f(x).

Vertex of g(x)g(x):

  1. Absolute Value Function:
    • The general form of an absolute value function is g(x)=axh+kg(x) = a|x - h| + k, where (h,k)(h, k) is the vertex of the function.
    • In g(x)=3x+42g(x) = 3|x + 4| - 2, we can rewrite the expression inside the absolute value as x(4)|x - (-4)|, which means h=4h = -4 and k=2k = -2.
    • So, the vertex of g(x)g(x) is (4,2)(-4, -2).

X-intercept of g(x)g(x):

To find the x-intercept, set g(x)=0g(x) = 0: 3x+42=03|x + 4| - 2 = 0 3x+4=23|x + 4| = 2 x+4=23|x + 4| = \frac{2}{3} This gives two solutions: x+4=23orx+4=23x + 4 = \frac{2}{3} \quad \text{or} \quad x + 4 = -\frac{2}{3} x=4+23=103orx=423=143x = -4 + \frac{2}{3} = -\frac{10}{3} \quad \text{or} \quad x = -4 - \frac{2}{3} = -\frac{14}{3} So, the x-intercepts of g(x)g(x) are x=103x = -\frac{10}{3} and x=143x = -\frac{14}{3}.

Y-intercept of g(x)g(x):

To find the y-intercept, set x=0x = 0: g(0)=30+42=3(4)2=122=10g(0) = 3|0 + 4| - 2 = 3(4) - 2 = 12 - 2 = 10 So, the y-intercept of g(x)g(x) is 1010.


Now, let's evaluate the possible options:

  1. The function f(x)f(x) has the same range as g(x)g(x):

    • The range of g(x)g(x) depends on the vertical stretch and shift. Since the vertex is (4,2)(-4, -2), the function will have a minimum value at y=2y = -2, and the range is [2,)[-2, \infty). If f(x)f(x) has the same range, this could be true, but more information on f(x)f(x) is needed to confirm.
  2. The function f(x)f(x) has the same vertex as g(x)g(x):

    • The vertex of g(x)g(x) is (4,2)(-4, -2). If f(x)f(x) has the same vertex, this could be correct.
  3. The function f(x)f(x) has the same x-intercept as g(x)g(x):

    • The x-intercepts of g(x)g(x) are x=103x = -\frac{10}{3} and x=143x = -\frac{14}{3}. More information on f(x)f(x) is needed to confirm this.
  4. The function f(x)f(x) has the same y-intercept as g(x)g(x):

    • The y-intercept of g(x)g(x) is 1010. If f(x)f(x) also has the same y-intercept, this would be true.

Conclusion:

Without more details about f(x)f(x), we cannot definitively determine which of the options is correct. However, based on common comparisons between functions like this, the most likely correct statement is:

"The function f(x)f(x) has the same y-intercept as g(x)g(x)", assuming that f(x)f(x) shares the y-intercept of 10 with g(x)g(x).

Would you like more details or clarifications on any part of the solution? Here are some additional questions that could help expand understanding:

  1. What would the range of f(x)f(x) look like if it had a different vertical shift?
  2. How does the slope of g(x)g(x) change based on the coefficient of the absolute value?
  3. Could f(x)f(x) have the same x-intercepts as g(x)g(x) if it's a different form of function?
  4. How does changing the vertex affect the graph of absolute value functions?
  5. How would the graph of f(x)f(x) compare if it had a negative leading coefficient?

Tip: For absolute value functions, identifying the vertex and intercepts is a key step in analyzing their graphs.

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Math Problem Analysis

Mathematical Concepts

Algebra
Absolute Value Functions
Vertex
Intercepts

Formulas

g(x) = a|x - h| + k (vertex form of absolute value function)
X-intercept: Set g(x) = 0 and solve
Y-intercept: Set x = 0 and solve

Theorems

Vertex formula for absolute value functions
Intercepts in function analysis

Suitable Grade Level

Grades 9-11