How do you simplify sqrt20 * sqrt45 ? Algebra Radicals and Geometry Connections Multiplication and Division of Radicals 1 Answer Gerardina C. Jun 30, 2016 30 Explanation: sqrt(20)=sqrt(4)*sqrt(5)=2sqrt(5) sqrt(45)=sqrt(5)*sqrt(9)=3sqrt(5) so sqrt(20)*sqrt(45)=2sqrt(5)*3sqrt(5)=6sqrt(25)=6*5=30 Answer link Related questions How do you simplify \frac{2}{\sqrt{3}}? How do you multiply and divide radicals? How do you rationalize the denominator? What is Multiplication and Division of Radicals? How do you simplify 7/(""^3sqrt(5)? How do you multiply (sqrt(a) +sqrt(b))(sqrt(a)-sqrt(b))? How do you rationalize the denominator for \frac{2x}{\sqrt{5}x}? Do you always have to rationalize the denominator? How do you simplify sqrt(5)sqrt(15)? How do you simplify (7sqrt(13) + 2sqrt(6))(2sqrt(3)+3sqrt(6))? See all questions in Multiplication and Division of Radicals Impact of this question 1183 views around the world You can reuse this answer Creative Commons License