(√5 +3)/(√2 +2)

1 answer

To simplify the expression \(\frac{\sqrt{5} + 3}{\sqrt{2} + 2}\), we can rationalize the denominator by multiplying the numerator and the denominator by the conjugate of the denominator, which is \(\sqrt{2} - 2\).

Let's perform the rationalization:

\[ \frac{\sqrt{5} + 3}{\sqrt{2} + 2} \cdot \frac{\sqrt{2} - 2}{\sqrt{2} - 2} \]

This results in:

\[ \frac{(\sqrt{5} + 3)(\sqrt{2} - 2)}{(\sqrt{2} + 2)(\sqrt{2} - 2)} \]

Now, let's simplify the denominator:

\[ (\sqrt{2} + 2)(\sqrt{2} - 2) = (\sqrt{2})^2 - (2)^2 = 2 - 4 = -2 \]

Next, we need to simplify the numerator:

\[ (\sqrt{5} + 3)(\sqrt{2} - 2) = \sqrt{5}\sqrt{2} - 2\sqrt{5} + 3\sqrt{2} - 6 \]

This can be rewritten as:

\[ \sqrt{10} - 2\sqrt{5} + 3\sqrt{2} - 6 \]

Combining the numerator with the denominator gives us:

\[ \frac{\sqrt{10} - 2\sqrt{5} + 3\sqrt{2} - 6}{-2} \]

We can split this into separate terms:

\[ -\frac{\sqrt{10}}{2} + \frac{2\sqrt{5}}{2} - \frac{3\sqrt{2}}{2} + 3 \]

This simplifies to:

\[ -\frac{\sqrt{10}}{2} + \sqrt{5} - \frac{3\sqrt{2}}{2} + 3 \]

Thus, the simplified form of the expression \(\frac{\sqrt{5} + 3}{\sqrt{2} + 2}\) is:

\[ 3 + \sqrt{5} - \frac{3\sqrt{2}}{2} - \frac{\sqrt{10}}{2} \]