binom2i - Metamath Proof Explorer

	Metamath Proof Explorer		< Previous Next > Nearby theorems
Mirrors > Home > MPE Home > Th. List > binom2i		Structured version Visualization version GIF version

Theorem binom2i 13909

Description: The square of a binomial. (Contributed by NM, 11-Aug-1999.)

**Hypotheses**
Ref	Expression
binom2.1	⊢ 𝐴 ∈ ℂ
binom2.2	⊢ 𝐵 ∈ ℂ

**Assertion**
Ref	Expression
binom2i	⊢ ((𝐴 + 𝐵)↑2) = (((𝐴↑2) + (2 · (𝐴 · 𝐵))) + (𝐵↑2))

**Proof of Theorem binom2i**
Step	Hyp	Ref	Expression
1		binom2.1	. . . . 5 ⊢ 𝐴 ∈ ℂ
2		binom2.2	. . . . 5 ⊢ 𝐵 ∈ ℂ
3	1, 2	addcli 10965	. . . 4 ⊢ (𝐴 + 𝐵) ∈ ℂ
4	3, 1, 2	adddii 10971	. . 3 ⊢ ((𝐴 + 𝐵) · (𝐴 + 𝐵)) = (((𝐴 + 𝐵) · 𝐴) + ((𝐴 + 𝐵) · 𝐵))
5	1, 2, 1	adddiri 10972	. . . . . 6 ⊢ ((𝐴 + 𝐵) · 𝐴) = ((𝐴 · 𝐴) + (𝐵 · 𝐴))
6	2, 1	mulcomi 10967	. . . . . . 7 ⊢ (𝐵 · 𝐴) = (𝐴 · 𝐵)
7	6	oveq2i 7279	. . . . . 6 ⊢ ((𝐴 · 𝐴) + (𝐵 · 𝐴)) = ((𝐴 · 𝐴) + (𝐴 · 𝐵))
8	5, 7	eqtri 2767	. . . . 5 ⊢ ((𝐴 + 𝐵) · 𝐴) = ((𝐴 · 𝐴) + (𝐴 · 𝐵))
9	1, 2, 2	adddiri 10972	. . . . 5 ⊢ ((𝐴 + 𝐵) · 𝐵) = ((𝐴 · 𝐵) + (𝐵 · 𝐵))
10	8, 9	oveq12i 7280	. . . 4 ⊢ (((𝐴 + 𝐵) · 𝐴) + ((𝐴 + 𝐵) · 𝐵)) = (((𝐴 · 𝐴) + (𝐴 · 𝐵)) + ((𝐴 · 𝐵) + (𝐵 · 𝐵)))
11	1, 1	mulcli 10966	. . . . . 6 ⊢ (𝐴 · 𝐴) ∈ ℂ
12	1, 2	mulcli 10966	. . . . . 6 ⊢ (𝐴 · 𝐵) ∈ ℂ
13	11, 12	addcli 10965	. . . . 5 ⊢ ((𝐴 · 𝐴) + (𝐴 · 𝐵)) ∈ ℂ
14	2, 2	mulcli 10966	. . . . 5 ⊢ (𝐵 · 𝐵) ∈ ℂ
15	13, 12, 14	addassi 10969	. . . 4 ⊢ ((((𝐴 · 𝐴) + (𝐴 · 𝐵)) + (𝐴 · 𝐵)) + (𝐵 · 𝐵)) = (((𝐴 · 𝐴) + (𝐴 · 𝐵)) + ((𝐴 · 𝐵) + (𝐵 · 𝐵)))
16	11, 12, 12	addassi 10969	. . . . 5 ⊢ (((𝐴 · 𝐴) + (𝐴 · 𝐵)) + (𝐴 · 𝐵)) = ((𝐴 · 𝐴) + ((𝐴 · 𝐵) + (𝐴 · 𝐵)))
17	16	oveq1i 7278	. . . 4 ⊢ ((((𝐴 · 𝐴) + (𝐴 · 𝐵)) + (𝐴 · 𝐵)) + (𝐵 · 𝐵)) = (((𝐴 · 𝐴) + ((𝐴 · 𝐵) + (𝐴 · 𝐵))) + (𝐵 · 𝐵))
18	10, 15, 17	3eqtr2i 2773	. . 3 ⊢ (((𝐴 + 𝐵) · 𝐴) + ((𝐴 + 𝐵) · 𝐵)) = (((𝐴 · 𝐴) + ((𝐴 · 𝐵) + (𝐴 · 𝐵))) + (𝐵 · 𝐵))
19	4, 18	eqtri 2767	. 2 ⊢ ((𝐴 + 𝐵) · (𝐴 + 𝐵)) = (((𝐴 · 𝐴) + ((𝐴 · 𝐵) + (𝐴 · 𝐵))) + (𝐵 · 𝐵))
20	3	sqvali 13878	. 2 ⊢ ((𝐴 + 𝐵)↑2) = ((𝐴 + 𝐵) · (𝐴 + 𝐵))
21	1	sqvali 13878	. . . 4 ⊢ (𝐴↑2) = (𝐴 · 𝐴)
22	12	2timesi 12094	. . . 4 ⊢ (2 · (𝐴 · 𝐵)) = ((𝐴 · 𝐵) + (𝐴 · 𝐵))
23	21, 22	oveq12i 7280	. . 3 ⊢ ((𝐴↑2) + (2 · (𝐴 · 𝐵))) = ((𝐴 · 𝐴) + ((𝐴 · 𝐵) + (𝐴 · 𝐵)))
24	2	sqvali 13878	. . 3 ⊢ (𝐵↑2) = (𝐵 · 𝐵)
25	23, 24	oveq12i 7280	. 2 ⊢ (((𝐴↑2) + (2 · (𝐴 · 𝐵))) + (𝐵↑2)) = (((𝐴 · 𝐴) + ((𝐴 · 𝐵) + (𝐴 · 𝐵))) + (𝐵 · 𝐵))
26	19, 20, 25	3eqtr4i 2777	1 ⊢ ((𝐴 + 𝐵)↑2) = (((𝐴↑2) + (2 · (𝐴 · 𝐵))) + (𝐵↑2))

Colors of variables: wff setvar class

Syntax hints: = wceq 1541 ∈ wcel 2109 (class class class)co 7268 ℂcc 10853 + caddc 10858 · cmul 10860 2c2 12011 ↑cexp 13763

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1801 ax-4 1815 ax-5 1916 ax-6 1974 ax-7 2014 ax-8 2111 ax-9 2119 ax-10 2140 ax-11 2157 ax-12 2174 ax-ext 2710 ax-sep 5226 ax-nul 5233 ax-pow 5291 ax-pr 5355 ax-un 7579 ax-cnex 10911 ax-resscn 10912 ax-1cn 10913 ax-icn 10914 ax-addcl 10915 ax-addrcl 10916 ax-mulcl 10917 ax-mulrcl 10918 ax-mulcom 10919 ax-addass 10920 ax-mulass 10921 ax-distr 10922 ax-i2m1 10923 ax-1ne0 10924 ax-1rid 10925 ax-rnegex 10926 ax-rrecex 10927 ax-cnre 10928 ax-pre-lttri 10929 ax-pre-lttrn 10930 ax-pre-ltadd 10931 ax-pre-mulgt0 10932

This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1544 df-fal 1554 df-ex 1786 df-nf 1790 df-sb 2071 df-mo 2541 df-eu 2570 df-clab 2717 df-cleq 2731 df-clel 2817 df-nfc 2890 df-ne 2945 df-nel 3051 df-ral 3070 df-rex 3071 df-reu 3072 df-rab 3074 df-v 3432 df-sbc 3720 df-csb 3837 df-dif 3894 df-un 3896 df-in 3898 df-ss 3908 df-pss 3910 df-nul 4262 df-if 4465 df-pw 4540 df-sn 4567 df-pr 4569 df-tp 4571 df-op 4573 df-uni 4845 df-iun 4931 df-br 5079 df-opab 5141 df-mpt 5162 df-tr 5196 df-id 5488 df-eprel 5494 df-po 5502 df-so 5503 df-fr 5543 df-we 5545 df-xp 5594 df-rel 5595 df-cnv 5596 df-co 5597 df-dm 5598 df-rn 5599 df-res 5600 df-ima 5601 df-pred 6199 df-ord 6266 df-on 6267 df-lim 6268 df-suc 6269 df-iota 6388 df-fun 6432 df-fn 6433 df-f 6434 df-f1 6435 df-fo 6436 df-f1o 6437 df-fv 6438 df-riota 7225 df-ov 7271 df-oprab 7272 df-mpo 7273 df-om 7701 df-2nd 7818 df-frecs 8081 df-wrecs 8112 df-recs 8186 df-rdg 8225 df-er 8472 df-en 8708 df-dom 8709 df-sdom 8710 df-pnf 10995 df-mnf 10996 df-xr 10997 df-ltxr 10998 df-le 10999 df-sub 11190 df-neg 11191 df-nn 11957 df-2 12019 df-n0 12217 df-z 12303 df-uz 12565 df-seq 13703 df-exp 13764

This theorem is referenced by: binom2 13914 nn0opthlem1 13963 2lgsoddprmlem3d 26542 ax5seglem7 27284 norm-ii-i 29478 quad3 33607

W3C validator