1/u = 1/f -1/v
1/v = 1/u + 1/f
3 different pairs are...
0+1=1
-1+2=1
-2+3=1
(3x(a)-6x)- (6a-12) Multiply the outside with the inside
The factors of 48 are 1,2,3,4,6,8,12,16,24, and 48. Take factors of 4, and see which of them are not on that list.
Did this a couple years ago, im kinda lost xD . sorry
