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What is an approximate solution to this equation?

[tex]\frac{4}{x-5}=\sqrt{x+3}+2[/tex]

A. [tex]x \approx 3.73[/tex]
B. [tex]x \approx 4.97[/tex]
C. [tex]x \approx -0.80[/tex]
D. [tex]x \approx 5.81[/tex]

Sagot :

To solve the equation:
[tex]\[ \frac{4}{x-5} = \sqrt{x+3} + 2 \][/tex]

we can follow these steps:

### Step 1: Rearrange the equation
Firstly, we want to isolate terms involving [tex]\( x \)[/tex]. The given equation can be written without changing the structure:
[tex]\[ \frac{4}{x-5} = \sqrt{x+3} + 2 \][/tex]

### Step 2: Consider possible values
Replace [tex]\( x \)[/tex] with the values given in the options to check which one satisfies the equation approximately.

#### Option A: [tex]\( x \approx 3.73 \)[/tex]
[tex]\[ \frac{4}{3.73-5} = \sqrt{3.73+3} + 2 \][/tex]
[tex]\[ \frac{4}{-1.27} \approx \sqrt{6.73} + 2 \][/tex]
[tex]\[ \approx -3.15 \neq 4.60 \][/tex]
This value does not satisfy the equation.

#### Option B: [tex]\( x \approx 4.97 \)[/tex]
[tex]\[ \frac{4}{4.97-5} = \sqrt{4.97+3} + 2 \][/tex]
[tex]\[ \frac{4}{-0.03} \approx \sqrt{7.97} + 2 \][/tex]
[tex]\[ \approx -133.33 \neq 4.82 \][/tex]
This value also does not satisfy the equation.

#### Option C: [tex]\( x \approx -0.80 \)[/tex]
[tex]\[ \frac{4}{-0.80-5} = \sqrt{-0.80+3} + 2 \][/tex]
[tex]\[ \frac{4}{-5.80} \approx \sqrt{2.20} + 2 \][/tex]
[tex]\[ \approx -0.69 \neq 3.48 \][/tex]
This value does not satisfy the equation either.

#### Option D: [tex]\( x \approx 5.81 \)[/tex]
[tex]\[ \frac{4}{5.81-5} = \sqrt{5.81+3} + 2 \][/tex]
[tex]\[ \frac{4}{0.81} \approx \sqrt{8.81} + 2 \][/tex]
[tex]\[ \approx 4.94 \approx 4.97 \][/tex]
This value satisfies the equation approximately.

### Conclusion
The correct approximate solution that satisfies the equation is:
[tex]\[ x \approx 5.81 \][/tex]

So, the correct answer is:
[tex]\[ \boxed{D} \][/tex]
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