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What are the factors of 405?

Answer 1

Skylar Adams

factors #{1,3,9,15,27,45,81,135, 405, }#

A factor of a number is a number that divides exactly into that number eg. 4 is a factor of 16.

To find factors try and pair them up.

for 405

#1xx405=405 :. 1 & 405# are factors

5 divides into 405 so:

#5xx81=405#

now since #81# is a factor and NOT a prime number all the other factors of #81# must be factors of #405#

we have 3, 9, 27 now find pairs.

#3xx135 =405#

#9xx45#

#27xx15#

now check other combinations of the factors

#3xx81=243# not a factor; once we are half way there are no more factors.Similarly for all other combinations.

factors #{1,3,9,15,27,45,81,135, 405, }#

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Answer 2

Everly Taylor

The factors of 405 are 1, 3, 5, 9, 15, 27, 45, 81, 135, and 405.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.