Geometric proofs of some non-geometric facts. Algebraic identities.

CONTENT
00:00 — Geometry is not as distant from the other maths as one may think
00:26 — Product of two sums of two terms: (a+b)(c-d) including (a+b)².
03:12 — Product of two sums having more that two terms, including (a+b+c)².
04:11 — Product of difference to a difference: (a-b)(c-d) including (a-b)².
06:55 — Product of sum to a difference: (a+b)(c-d), including (a+b)(a-b).
09:32 — Identities for (a+b)²± (a-b)².
11:52 — Cube of sum of two numbers: (a+b)³.

#geometry #algebra #identity