SOLUTION: I am learning prime factored form and i dont undersand it , i know its simple but how do i find it? the problem I just did was the prime factored form of 45.... myanswer was 45=5x9

Algebra ->  Divisibility and Prime Numbers -> SOLUTION: I am learning prime factored form and i dont undersand it , i know its simple but how do i find it? the problem I just did was the prime factored form of 45.... myanswer was 45=5x9      Log On


   

Question 407375: I am learning prime factored form and i dont undersand it , i know its simple but how do i find it? the problem I just did was the prime factored form of 45.... myanswer was 45=5x9 is that correct ? but now i am stuck on 78 how do i do it????? please help me.
Found 2 solutions by jim_thompson5910, rfer:
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Now factor 9 into 3x3.


So 45 = 5x3x3 or 45 = 3x3x5. You'll also see it as


Notice 2 goes into 78. So 78 = 2x39 (divide 78 by 2 to get 39). Now factor 39 into 3x13. So 78 = 2x3x13. Now we're done because every factor is a prime factor.


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Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
On your first question 9 is not a prime factor, 9 fators to 3X3
answer is 5 X 3 X 3
Second question
78
2 X 39
the 2 is prime, so it just comes down and we factor 39
2 X 3 X 13