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Given [tex]f(x) = x^2 + 2x - 5[/tex] and values of the linear function [tex]g(x)[/tex] in the table, what is the range of [tex](f + g)(x)[/tex]?

[tex]\[
\begin{tabular}{|c|c|c|c|c|}
\hline
x & -6 & -3 & -1 & 4 \\
\hline
g(x) & 16 & 10 & 6 & -4 \\
\hline
\end{tabular}
\][/tex]

A. [tex](-\infty, -1][/tex]

B. [tex][-1, \infty)[/tex]

C. [tex][-1, 1][/tex]


Sagot :

To address the problem, we need to calculate the combined function [tex]\((f + g)(x)\)[/tex] for each given [tex]\(x\)[/tex] value from the table, using the expression for [tex]\(f(x)\)[/tex] and the provided values for [tex]\(g(x)\)[/tex].

1. Calculate [tex]\(f(x)\)[/tex] for each [tex]\(x\)[/tex] value:

[tex]\[ f(x) = x^2 + 2x - 5 \][/tex]

Evaluate [tex]\(f(x)\)[/tex] for each given [tex]\(x\)[/tex]:

- For [tex]\(x = -6\)[/tex]:

[tex]\[ f(-6) = (-6)^2 + 2(-6) - 5 = 36 - 12 - 5 = 19 \][/tex]

- For [tex]\(x = -3\)[/tex]:

[tex]\[ f(-3) = (-3)^2 + 2(-3) - 5 = 9 - 6 - 5 = -2 \][/tex]

- For [tex]\(x = -1\)[/tex]:

[tex]\[ f(-1) = (-1)^2 + 2(-1) - 5 = 1 - 2 - 5 = -6 \][/tex]

- For [tex]\(x = 4\)[/tex]:

[tex]\[ f(4) = 4^2 + 2(4) - 5 = 16 + 8 - 5 = 19 \][/tex]

2. Combine [tex]\(f(x)\)[/tex] with [tex]\(g(x)\)[/tex]:

Evaluate [tex]\((f + g)(x)\)[/tex] by adding [tex]\(f(x)\)[/tex] and [tex]\(g(x)\)[/tex]:

- For [tex]\(x = -6\)[/tex]:

[tex]\[ (f + g)(-6) = f(-6) + g(-6) = 19 + 16 = 35 \][/tex]

- For [tex]\(x = -3\)[/tex]:

[tex]\[ (f + g)(-3) = f(-3) + g(-3) = -2 + 10 = 8 \][/tex]

- For [tex]\(x = -1\)[/tex]:

[tex]\[ (f + g)(-1) = f(-1) + g(-1) = -6 + 6 = 0 \][/tex]

- For [tex]\(x = 4\)[/tex]:

[tex]\[ (f + g)(4) = f(4) + g(4) = 19 - 4 = 15 \][/tex]

3. Determine the range of [tex]\((f + g)(x)\)[/tex]:

The values of [tex]\((f + g)(x)\)[/tex] are 35, 8, 0, and 15.

- The minimum value is 0.
- The maximum value is 35.

Therefore, the range of [tex]\((f + g)(x)\)[/tex] is [tex]\([0, 35]\)[/tex] and does not fit within any of the given intervals:

- [tex]\((-\infty, -1]\)[/tex]
- [tex]\([-1, \infty)\)[/tex]
- [tex]\([-1, 1]\)[/tex]

However, the accurate range of the resulting values of the function [tex]\((f + g)(x)\)[/tex] calculated is [tex]\([0, 35]\)[/tex]. Therefore, based on context and the given response options, none of them are relevant to the correct solution of [tex]\( [0, 35] \)[/tex].
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