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The table shows certain values of a cubic function.

[tex]\[
\begin{array}{|c|c|c|c|c|c|c|c|c|c|c|c|c|c|c|c|}
\hline
x & -7 & -6 & -5 & -4 & -3 & -2 & -1 & 0 & 1 & 2 & 3 & 4 & 5 & 6 & 7 \\
\hline
y & 216 & 110 & 40 & 0 & -16 & -14 & 0 & 20 & 40 & 54 & 56 & 40 & 0 & -70 & -176 \\
\hline
\end{array}
\][/tex]

Use the table to complete the statements.

The function has a relative maximum when [tex]\( x \)[/tex] is near [tex]\(\_\_\_\_\_\)[/tex]

As [tex]\( x \)[/tex] approaches positive infinity, the value of the function approaches [tex]\(\_\_\_\_\_\)[/tex]


Sagot :

To solve these statements, let's look into the given information.

1. Finding the relative maximum:
A relative maximum of a function occurs at points where the first derivative changes from positive to negative. The first derivative indicates the rate of change of the function's value with respect to [tex]\( x \)[/tex].

From the given values:
[tex]\[ y = 216, 110, 40, 0, -16, -14, 0, 20, 40, 54, 56, 40, 0, -70, -176 \][/tex]

The calculated first derivatives are:
[tex]\[ [-106, -70, -40, -16, 2, 14, 20, 20, 14, 2, -16, -40, -70, -106] \][/tex]

Observing the change of signs in the first derivatives, it is positive before [tex]\( x = 3 \)[/tex] and negative after [tex]\( x = 3 \)[/tex].

Thus, the function has a relative maximum near [tex]\( x = 3 \)[/tex].

2. Behavior as [tex]\( x \)[/tex] approaches positive infinity:
A cubic function tends to [tex]\(\infty\)[/tex] or [tex]\(-\infty\)[/tex] as [tex]\( x \)[/tex] approaches [tex]\(\infty\)[/tex], depending on the leading coefficient of the cubic term. Given the values and the nature of the function, it suggests the polynomial has a positive leading coefficient.

Consequently, as [tex]\( x \)[/tex] approaches positive infinity, the value of the function approaches [tex]\(\infty\)[/tex].

Therefore, the completed statements are:

- The function has a relative maximum when [tex]\( x \)[/tex] is near [tex]\( \boxed{3} \)[/tex].
- As [tex]\( x \)[/tex] approaches positive infinity, the value of the function approaches [tex]\( \boxed{\infty} \)[/tex].