I can help! With the Greatest Common Factor you figure out the greatest number that can go into all numbers. The number here would be the 2. You then divide 2 by all the numbers in the problem.
You would end up getting x^2 + 6x + 9
I use to struggle with this too. Hope this helps! Have a great day!!
The answer is 15625
I put this in a calc to check it and it is correct
You would do 20 • 3=60 and the you would add 20 • 1/5=4 so, your total is 64in.
1m= 1000mm
so 64mm*1m/1000mm=64/1000m
Insert a picture so I can help you out :)