Evaluate square root of 45* square root of 20

$\sqrt{45} \cdot \sqrt{20}$

Step 1

Combine using the product rule for radicals.

$\sqrt{45 \cdot 20}$

Step 2

Write the expression using exponents.

Multiply $45$ by $20$ .

$\sqrt{900}$

Rewrite $900$ as $30^{2}$ .

$\sqrt{30^{2}}$

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

$30$