Math Problem Statement

Complete the table of values for the functions f(x) = (5/2)x - 3 and g(x) = -(x - 2)^2 + 4. Based on the values in the table, where does the equation f(x) = g(x) have a solution?

Solution

To analyze the problem, we are comparing two functions:

  1. f(x)=52x3f(x) = \frac{5}{2}x - 3
  2. g(x)=(x2)2+4g(x) = -(x - 2)^2 + 4

Step 1: Completing the Table

We evaluate f(x)f(x) and g(x)g(x) for the given values of xx. I'll double-check and fill in the missing values:

For f(x)=52x3f(x) = \frac{5}{2}x - 3:

  • x=2:f(2)=52(2)3=53=2x = 2: f(2) = \frac{5}{2}(2) - 3 = 5 - 3 = 2
  • x=3:f(3)=52(3)3=1523=92x = 3: f(3) = \frac{5}{2}(3) - 3 = \frac{15}{2} - 3 = \frac{9}{2}
  • x=4:f(4)=52(4)3=103=7x = 4: f(4) = \frac{5}{2}(4) - 3 = 10 - 3 = 7

For g(x)=(x2)2+4g(x) = -(x - 2)^2 + 4:

  • x=2:g(2)=(22)2+4=0+4=4x = 2: g(2) = -(2 - 2)^2 + 4 = 0 + 4 = 4
  • x=3:g(3)=(32)2+4=1+4=3x = 3: g(3) = -(3 - 2)^2 + 4 = -1 + 4 = 3
  • x=4:g(4)=(42)2+4=4+4=0x = 4: g(4) = -(4 - 2)^2 + 4 = -4 + 4 = 0

Updated Table:

xxf(x)f(x)g(x)g(x)
0-30
1-12\frac{1}{2}3
224
392\frac{9}{2}3
470

Step 2: Determining Where f(x)=g(x)f(x) = g(x)

We need to find xx such that f(x)=g(x)f(x) = g(x). From the table:

  • At x=2x = 2: f(2)=2f(2) = 2 and g(2)=4g(2) = 4 → Not equal.
  • At x=3x = 3: f(3)=92=4.5f(3) = \frac{9}{2} = 4.5 and g(3)=3g(3) = 3 → Not equal.

Check between values:

  1. Between x=2x = 2 and x=3x = 3, f(x)f(x) increases from 22 to 4.54.5 and g(x)g(x) decreases from 44 to 33. There is a crossing point where f(x)=g(x)f(x) = g(x). Solution exists between x=2x = 2 and x=3x = 3.
  2. Between x=3x = 3 and x=4x = 4, f(x)f(x) increases from 4.54.5 to 77 and g(x)g(x) decreases from 33 to 00. No crossing.

Final Answer:

The solution to f(x)=g(x)f(x) = g(x) is between x=2x = 2 and x=3x = 3.

Would you like me to elaborate on solving these equations algebraically or clarify any step?


Follow-Up Questions:

  1. How do we solve 52x3=(x2)2+4\frac{5}{2}x - 3 = -(x - 2)^2 + 4 algebraically?
  2. What do the graphs of f(x)f(x) and g(x)g(x) look like, and where do they intersect?
  3. How does the rate of change (slope) of f(x)f(x) compare to g(x)g(x) near their intersection?
  4. Can we estimate the solution numerically using interpolation?
  5. What happens to f(x)f(x) and g(x)g(x) as xx \to \infty?

Tip: When comparing functions numerically, always test for trends (increasing vs. decreasing) to identify crossing intervals.

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Math Problem Analysis

Mathematical Concepts

Linear Functions
Quadratic Functions
Intersection of Functions
Tables of Values

Formulas

f(x) = (5/2)x - 3
g(x) = -(x - 2)^2 + 4

Theorems

Function Intersection Theorem
Quadratic Function Analysis

Suitable Grade Level

Grade 8-10