Multiply. Remember if you multiply the same two numbers together it's equivalent to squaring them. Since you're multiplying a square root number by the same square root number, the square root cancels out and you're just left with the number
e.g. √3*√3 = 3 - or you can think of it like √3*√3 = √9 and √9 = 3
√3 * √15 = √45 since it's just 3*15 under a root. Then you can simply the √45
Multiply. Remember if you multiply the same two numbers together it's equivalent to squaring them. Since you're multiplying a square root number by the same square root number, the square root cancels out and you're just left with the number
e.g. √3*√3 = 3 - or you can think of it like √3*√3 = √9 and √9 = 3
√3 * √15 = √45 since it's just 3*15 under a root. Then you can simply the √45