Question

How do you write the prime factorization of 87?

Answer 1

`87= color(green)(3xx29)`

Explanation:

`89` is not divisible by`2`, so we need to try the next prime: `3`

`89div3 = 29`

`29` is not divisible by `3`, so we need to try the next prime: `5`

`29` is not divisible by `5`, so we need to try the next prime: `7`

...but `7^2` is greater than `29`, so no other factors are possible.

The only prime factors of `89` are `3` and `29`