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[tex]f(x)[/tex] and [tex]g(x)[/tex] are continuous functions. The table below lists the values of [tex]f(x)[/tex] and [tex]g(x)[/tex] and their derivatives for certain values of [tex]x[/tex].

[tex]\[
\begin{tabular}{|c|c|c|c|c|}
\hline
x & f(x) & g(x) & f^{\prime}(x) & g^{\prime}(x) \\
\hline
-4 & 2 & -3 & -3 & 3 \\
\hline
2 & -4 & 6 & 3 & 7 \\
\hline
3 & -5 & -7 & -5 & -3 \\
\hline
6 & -3 & -2 & 1 & -3 \\
\hline
7 & 2 & 3 & -1 & 2 \\
\hline
\end{tabular}
\][/tex]

Use the values in the table to find [tex]h^{\prime}(2)[/tex] where [tex]h(x)=\frac{f(x)}{g(x)}[/tex].

(Express your answer as a decimal rounded to 3 decimal places)


Sagot :

To find [tex]\( h'(x) \)[/tex] where [tex]\( h(x) = \frac{f(x)}{g(x)} \)[/tex], we can use the quotient rule for differentiation. The quotient rule states that if [tex]\( h(x) = \frac{f(x)}{g(x)} \)[/tex], then

[tex]\[ h'(x) = \frac{f'(x) g(x) - f(x) g'(x)}{(g(x))^2} \][/tex]

We are given the values at [tex]\( x = 2 \)[/tex] from the table:
[tex]\[ f(2) = -4, \quad g(2) = 6, \quad f'(2) = 3, \quad g'(2) = 7 \][/tex]

Substitute these values into the quotient rule formula:

1. Calculate the numerator:
[tex]\[ \text{Numerator} = f'(2) \cdot g(2) - f(2) \cdot g'(2) \][/tex]
[tex]\[ \text{Numerator} = 3 \cdot 6 - (-4) \cdot 7 \][/tex]
[tex]\[ \text{Numerator} = 18 + 28 \][/tex]
[tex]\[ \text{Numerator} = 46 \][/tex]

2. Calculate the denominator:
[tex]\[ \text{Denominator} = (g(2))^2 \][/tex]
[tex]\[ \text{Denominator} = 6^2 \][/tex]
[tex]\[ \text{Denominator} = 36 \][/tex]

3. Divide the numerator by the denominator:
[tex]\[ h'(2) = \frac{46}{36} \][/tex]

4. Simplify and round the result to 3 decimal places:
[tex]\[ h'(2) \approx 1.278 \][/tex]

Thus, the derivative [tex]\( h'(2) \)[/tex] is approximately [tex]\( 1.278 \)[/tex].