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1. Find the values of the numbers [tex]m[/tex] and [tex]n[/tex] such that [tex]\sqrt{m} - \sqrt{n} = 2 \sqrt{2 - \sqrt{3}}[/tex].

Sagot :

Let's work through the problem systematically:

Given:
[tex]\[ \sqrt{m} - \sqrt{n} = 2 \sqrt{2 - \sqrt{3}} \][/tex]

### Step 1: Analyze [tex]\(2\sqrt{2-\sqrt{3}}\)[/tex]

We need to express [tex]\(2 \sqrt{2 - \sqrt{3}}\)[/tex] in a simpler form. Start by assuming:
[tex]\[ 2 - \sqrt{3} = (\sqrt{a} - \sqrt{b})^2 \][/tex]

### Step 2: Expand and Compare

Expand the expression on the right-hand side:
[tex]\[ (\sqrt{a} - \sqrt{b})^2 = a + b - 2\sqrt{ab} \][/tex]

Therefore:
[tex]\[ 2 - \sqrt{3} = a + b - 2\sqrt{ab} \][/tex]

### Step 3: Separate Real and Imaginary Parts

To satisfy the equation, equate the real and imaginary parts on both sides:

1. Real part:
[tex]\[ a + b = 2 \][/tex]

2. Imaginary part:
[tex]\[ -2\sqrt{ab} = -\sqrt{3} \Rightarrow 2\sqrt{ab} = \sqrt{3} \Rightarrow \sqrt{ab} = \frac{\sqrt{3}}{2} \][/tex]

Square both sides:
[tex]\[ ab = \left(\frac{\sqrt{3}}{2}\right)^2 = \frac{3}{4} \][/tex]

### Step 4: Solve the System of Equations

Now we have the system:
[tex]\[ a + b = 2 \][/tex]
[tex]\[ ab = \frac{3}{4} \][/tex]

These are the equations for which we solve for [tex]\(a\)[/tex] and [tex]\(b\)[/tex]. The quadratic equation derived from these equations is:
[tex]\[ t^2 - (a + b)t + ab = 0 \Rightarrow t^2 - 2t + \frac{3}{4} = 0 \][/tex]

Solving this quadratic equation:
[tex]\[ t = \frac{2 \pm \sqrt{4 - 3}}{2} = \frac{2 \pm 1}{2} \][/tex]

So, the solutions are:
[tex]\[ t = \frac{3}{2}, \quad t = \frac{1}{2} \][/tex]

Thus, [tex]\(a = \frac{3}{2}\)[/tex] and [tex]\(b = \frac{1}{2}\)[/tex].

### Step 5: Substitute Back

Hence:
[tex]\[ \sqrt{2 - \sqrt{3}} = \sqrt{\frac{3}{2}} - \sqrt{\frac{1}{2}} \][/tex]

And therefore:
[tex]\[ 2\sqrt{2 - \sqrt{3}} = 2\left(\sqrt{\frac{3}{2}} - \sqrt{\frac{1}{2}}\right) = 2\left(\frac{\sqrt{6}}{2} - \frac{\sqrt{2}}{2}\right) = \sqrt{6} - \sqrt{2} \][/tex]

### Step 6: Identify [tex]\(m\)[/tex] and [tex]\(n\)[/tex]

We need:
[tex]\[ \sqrt{m} - \sqrt{n} = \sqrt{6} - \sqrt{2} \][/tex]

So, by comparing both sides:
[tex]\[ \sqrt{m} = \sqrt{6}, \quad \sqrt{n} = \sqrt{2} \][/tex]

Squaring both sides, we find:
[tex]\[ m = 6, \quad n = 2 \][/tex]

Thus:
[tex]\[ \boxed{m = 6, \quad n = 2} \][/tex]