Express the numbers eight, fifteen and seventeen in base 2. i have forgotten how to do the base 2 question.

The quickest way for converting small numbers like this to binary would probably be to find the closest power of 2, then add/subtract intermediate powers of 2 as needed.

Converting 8 is immediate, since it's already a power of 2:



Converting 15 and 17 is also pretty easy if you're familiar with the rules of arithmetic in binary.

First subtract 10 from both side
y^2+6y-16=0
(y+8)(y-2)=0
-8 and 2