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Question
Math
Posted 5 months ago
Let h(x)=x2x+73h(x)=\frac{x-2}{\sqrt{x+7}-3} when x2x \neq 2.
hh is continuous for all x>7x>-7.
Find h(2)h(2).
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Answer from Sia
Posted 5 months ago
Solution by Steps
step 1
To find h(2)h(2), we need to evaluate the limit of h(x)h(x) as xx approaches 2
step 2
The limit is given by limx2x2x+73\lim_{x \to 2} \frac{x - 2}{\sqrt{x + 7} - 3}
step 3
Direct substitution of x=2x = 2 into h(x)h(x) results in an indeterminate form 00\frac{0}{0}
step 4
To resolve this, we can use the Taylor series expansion around x=2x = 2
step 5
The Taylor series expansion provided by asksia-ll calculator is 6+x261216(x2)2+(x2)338885(x2)4279936+7(x2)55038848+O((x2)6)6 + \frac{x - 2}{6} - \frac{1}{216} (x - 2)^2 + \frac{(x - 2)^3}{3888} - \frac{5 (x - 2)^4}{279936} + \frac{7 (x - 2)^5}{5038848} + O((x - 2)^6)
step 6
Evaluating the limit using the Taylor series, we find that limx2x2x+73=6\lim_{x \to 2} \frac{x - 2}{\sqrt{x + 7} - 3} = 6
step 7
Therefore, h(2)=6h(2) = 6
Answer
h(2)=6h(2) = 6
Key Concept
Evaluating limits using Taylor series
Explanation
When direct substitution in a limit results in an indeterminate form, a Taylor series expansion can be used to evaluate the limit. In this case, the expansion around x=2x = 2 for the function h(x)h(x) gives the value of the limit as xx approaches 2.

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