Question

Which number equals sqrt(162) ?
3 sqrt(9)
9 sqrt(2)
9 sqrt(3)
3 sqrt(2)

Answer 1

\[\sqrt{162} = \sqrt{81 \times 2} = 9\sqrt{2}\]

Answer 2

cept 2 sqrt 9 isnt a choice

Answer 3

first find its prime factorizations sqrt(2*81) which is the same thing as sqrt(2)*sqrt(81)

Answer 4

just realized that

Answer 5

derp.

Answer 6

oh sorry read that backwards

Answer 7

nah, i deleted.I believe you can put it either way. i had it 2sqrt(81)

Answer 8

how do you get the 81 and 2?

Answer 9

and sorry not prime factorizations, just start to factor it.

Answer 10

well you divide 162 by 2. and fine 2x81= 162

Answer 11

oooh thanks!

Answer 12

well you know 162 is divisible by 2, so just divide the number by 2. You just want to keep factoring until you find a square, and if you dont find a square then the square root cannot be rewritten.

Answer 13

k thx