- #1
Lukeitfc
- 7
- 0
I know it's easy to all you people, but my first question is, is this right:
Difference between ( X) x (X+21) and (X+1) x (X+20)=20
=(x²+x+20x+20)-(x²+21x)
=(x²+21x+20)-(x²+21x)
=(21x+20)-21x
=20
I think it is, that's one point
Point 2
I just can't find an expression which connects N(or Size) with Difference
N Size Difference
1 2x2 40
2 3x3 160
3 4x4 240
4 5x5 640
Thanks In Advance
Difference between ( X) x (X+21) and (X+1) x (X+20)=20
=(x²+x+20x+20)-(x²+21x)
=(x²+21x+20)-(x²+21x)
=(21x+20)-21x
=20
I think it is, that's one point
Point 2
I just can't find an expression which connects N(or Size) with Difference
N Size Difference
1 2x2 40
2 3x3 160
3 4x4 240
4 5x5 640
Thanks In Advance