Simplify ( square root of 2- square root of 5)^2

${(\sqrt{2} - \sqrt{5})}^{2}$

Step 1

Rewrite ${(\sqrt{2} - \sqrt{5})}^{2}$ as $(\sqrt{2} - \sqrt{5}) (\sqrt{2} - \sqrt{5})$ .

$(\sqrt{2} - \sqrt{5}) (\sqrt{2} - \sqrt{5})$

Step 2

Expand $(\sqrt{2} - \sqrt{5}) (\sqrt{2} - \sqrt{5})$ using the FOIL Method.

Apply the distributive property.

$\sqrt{2} (\sqrt{2} - \sqrt{5}) - \sqrt{5} (\sqrt{2} - \sqrt{5})$

Apply the distributive property.

$\sqrt{2} \sqrt{2} + \sqrt{2} (- \sqrt{5}) - \sqrt{5} (\sqrt{2} - \sqrt{5})$

Apply the distributive property.

$\sqrt{2} \sqrt{2} + \sqrt{2} (- \sqrt{5}) - \sqrt{5} \sqrt{2} - \sqrt{5} (- \sqrt{5})$

Step 3

Simplify and combine like terms.

Simplify each term.

Combine using the product rule for radicals.

$\sqrt{2 \cdot 2} + \sqrt{2} (- \sqrt{5}) - \sqrt{5} \sqrt{2} - \sqrt{5} (- \sqrt{5})$

Multiply $2$ by $2$ .

$\sqrt{4} + \sqrt{2} (- \sqrt{5}) - \sqrt{5} \sqrt{2} - \sqrt{5} (- \sqrt{5})$

Rewrite $4$ as $2^{2}$ .

$\sqrt{2^{2}} + \sqrt{2} (- \sqrt{5}) - \sqrt{5} \sqrt{2} - \sqrt{5} (- \sqrt{5})$

Pull terms out from under the radical, assuming positive real numbers.

$2 + \sqrt{2} (- \sqrt{5}) - \sqrt{5} \sqrt{2} - \sqrt{5} (- \sqrt{5})$

Multiply $\sqrt{2} (- \sqrt{5})$ .

Combine using the product rule for radicals.

$2 - \sqrt{2 \cdot 5} - \sqrt{5} \sqrt{2} - \sqrt{5} (- \sqrt{5})$

Multiply $2$ by $5$ .

$2 - \sqrt{10} - \sqrt{5} \sqrt{2} - \sqrt{5} (- \sqrt{5})$

Multiply $- \sqrt{5} \sqrt{2}$ .

Combine using the product rule for radicals.

$2 - \sqrt{10} - \sqrt{2 \cdot 5} - \sqrt{5} (- \sqrt{5})$

Multiply $2$ by $5$ .

$2 - \sqrt{10} - \sqrt{10} - \sqrt{5} (- \sqrt{5})$

Multiply $- \sqrt{5} (- \sqrt{5})$ .

Multiply $- 1$ by $- 1$ .

$2 - \sqrt{10} - \sqrt{10} + 1 \sqrt{5} \sqrt{5}$

Multiply $\sqrt{5}$ by $1$ .

$2 - \sqrt{10} - \sqrt{10} + \sqrt{5} \sqrt{5}$

Raise $\sqrt{5}$ to the power of $1$ .

$2 - \sqrt{10} - \sqrt{10} + {\sqrt{5}}^{1} \sqrt{5}$

Raise $\sqrt{5}$ to the power of $1$ .

$2 - \sqrt{10} - \sqrt{10} + {\sqrt{5}}^{1} {\sqrt{5}}^{1}$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$2 - \sqrt{10} - \sqrt{10} + {\sqrt{5}}^{1 + 1}$

Add $1$ and $1$ .

$2 - \sqrt{10} - \sqrt{10} + {\sqrt{5}}^{2}$

Rewrite ${\sqrt{5}}^{2}$ as $5$ .

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{5}$ as $5^{\frac{1}{2}}$ .

$2 - \sqrt{10} - \sqrt{10} + {(5^{\frac{1}{2}})}^{2}$

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$2 - \sqrt{10} - \sqrt{10} + 5^{\frac{1}{2} \cdot 2}$

Combine $\frac{1}{2}$ and $2$ .

$2 - \sqrt{10} - \sqrt{10} + 5^{\frac{2}{2}}$

Cancel the common factor of $2$ .

Cancel the common factor.

$2 - \sqrt{10} - \sqrt{10} + 5^{\frac{2}{2}}$

Rewrite the expression.

$2 - \sqrt{10} - \sqrt{10} + 5^{1}$

Evaluate the exponent.

$2 - \sqrt{10} - \sqrt{10} + 5$

Add $2$ and $5$ .

$7 - \sqrt{10} - \sqrt{10}$

Subtract $\sqrt{10}$ from $- \sqrt{10}$ .

$7 - 2 \sqrt{10}$

Step 4

The result can be shown in multiple forms.

Exact Form:

$7 - 2 \sqrt{10}$

Decimal Form:

$0.67544467 \dots$

Simplify ( square root of 2- square root of 5)^2

Related Questions

Support LCMGCF.com by disabling your adblocker.