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Find the limit $\lim_{x\to10}\left(\frac{\sqrt{x+6}-4}{x-10}\right)$

Step-by-step Solution

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Final Answer

$\frac{1}{8}$
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Step-by-step Solution

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1

If we directly evaluate the limit $\lim_{x\to 10}\left(\frac{\sqrt{x+6}-4}{x-10}\right)$ as $x$ tends to $10$, we can see that it gives us an indeterminate form

$\frac{0}{0}$
2

We can solve this limit by applying L'H么pital's rule, which consists of calculating the derivative of both the numerator and the denominator separately

$\lim_{x\to 10}\left(\frac{\frac{d}{dx}\left(\sqrt{x+6}-4\right)}{\frac{d}{dx}\left(x-10\right)}\right)$
3

After deriving both the numerator and denominator, the limit results in

$\lim_{x\to10}\left(\frac{1}{2}\left(x+6\right)^{-\frac{1}{2}}\right)$
4

The limit of the product of a function and a constant is equal to the limit of the function, times the constant: $\displaystyle \lim_{t\to 0}{\left(at\right)}=a\cdot\lim_{t\to 0}{\left(t\right)}$

$\frac{1}{2}\lim_{x\to10}\left(\left(x+6\right)^{-\frac{1}{2}}\right)$
5

Applying the property of exponents, $\displaystyle a^{-n}=\frac{1}{a^n}$, where $n$ is a number

$\frac{1}{2}\lim_{x\to10}\left(\frac{1}{\sqrt{x+6}}\right)$
6

Evaluate the limit $\lim_{x\to10}\left(\frac{1}{\sqrt{x+6}}\right)$ by replacing all occurrences of $x$ by $10$

$\frac{1}{2}\cdot \left(\frac{1}{\sqrt{10+6}}\right)$
7

Add the values $10$ and $6$

$\frac{1}{2}\cdot \left(\frac{1}{\sqrt{16}}\right)$
8

Calculate the power $\sqrt{16}$

$\frac{1}{2}\cdot \left(\frac{1}{4}\right)$
9

Divide $1$ by $4$

$\frac{1}{2}\frac{1}{4}$
10

Multiply $\frac{1}{2}$ times $\frac{1}{4}$

$\frac{1}{8}$

Final Answer

$\frac{1}{8}$

Exact Numeric Answer

$0.125$

Explore different ways to solve this problem

Solving a math problem using different methods is important because it enhances understanding, encourages critical thinking, allows for multiple solutions, and develops problem-solving strategies. Read more

Limits by Direct SubstitutionLimits by L'H么pital's ruleLimits by FactoringLimits by Rationalizing

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Function Plot

Plotting: $\frac{\sqrt{x+6}-4}{x-10}$

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0
a
b
c
d
f
g
m
n
u
v
w
x
y
z
.
(◻)
+
-
×
◻/◻
/
÷
2

e
π
ln
log
log
lim
d/dx
Dx
|◻|
θ
=
>
<
>=
<=
sin
cos
tan
cot
sec
csc

asin
acos
atan
acot
asec
acsc

sinh
cosh
tanh
coth
sech
csch

asinh
acosh
atanh
acoth
asech
acsch

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