Math Problem Statement

Which of the following functions could be used to find the nth term in the table?

Solution

To determine which function can be used to describe the values in the table, let’s analyze the table and compare it with the given options.


Step 1: Observing the Table

The table provides pairs of xx and f(x)f(x):

xxf(x)f(x)
1-4
2-14
3-30
4-52

We can see that f(x)f(x) is negative and decreasing rapidly. This suggests it might be a quadratic function.


Step 2: General Quadratic Form

The general quadratic form is:

f(x)=ax2+bx+cf(x) = ax^2 + bx + c

We can test the given options (no linear terms bxbx) step by step.


Step 3: Testing f(x)=4x2f(x) = 4x^2

  1. Substituting x=1x = 1: f(1) = 4(1)^2 = 4 \quad \text{(but table shows -4)}. There is a difference of 8-8. Adjusting, we rewrite: f(x)=4x28f(x) = 4x^2 - 8

  2. Check for x=2x = 2: [ f(2) = 4(2)^2 - 8 = 4(4) - 8 = 16 - 8 = - they

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Math Problem Analysis

Mathematical Concepts

Quadratic Functions
Algebra

Formulas

f(x) = ax^2 + bx + c

Theorems

Quadratic relationships in sequences

Suitable Grade Level

Grades 8-10