In view of the graphic capabilities of this site, you will need to use a fair amount of imagination! Here goes:
<------a+b------>
<----a----><-b->
+-----------+-----+
|. . . . . . . .|. . . .|
|. . . P. . . .|. .Q. |
|. . . . . . . .|. . . .|
+-----------+-----+
|. . . R. . . .|. .S. |
|. . . . . . . .|. . . .|
+----------+-----+
Where
P = a*a = a2
Q = a*b
R = b*a = a*b
S = b*b = b2
(a + b)2 = P + Q + R + S
= a2 + ab + ab + b2 = a2 + 2ab + b2
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a square plus 2ab plus b square
(a+b)cube = a cube + b cube + 3a square b + 3ab square
'a' minus 'b' whole cube is equal to 'a cube' minus 'b cube' minus (3 a square b ) plus (3 a b square) . .. .....thanks
25x (square) plus 40 plus 15 equals 680.
4.7916427e+21