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Mirrors > Home > MPE Home > Th. List > quad | Structured version Visualization version GIF version |
Description: The quadratic equation. (Contributed by Mario Carneiro, 23-Apr-2015.) |
Ref | Expression |
---|---|
quad.a | ⊢ (𝜑 → 𝐴 ∈ ℂ) |
quad.z | ⊢ (𝜑 → 𝐴 ≠ 0) |
quad.b | ⊢ (𝜑 → 𝐵 ∈ ℂ) |
quad.c | ⊢ (𝜑 → 𝐶 ∈ ℂ) |
quad.x | ⊢ (𝜑 → 𝑋 ∈ ℂ) |
quad.d | ⊢ (𝜑 → 𝐷 = ((𝐵↑2) − (4 · (𝐴 · 𝐶)))) |
Ref | Expression |
---|---|
quad | ⊢ (𝜑 → (((𝐴 · (𝑋↑2)) + ((𝐵 · 𝑋) + 𝐶)) = 0 ↔ (𝑋 = ((-𝐵 + (√‘𝐷)) / (2 · 𝐴)) ∨ 𝑋 = ((-𝐵 − (√‘𝐷)) / (2 · 𝐴))))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | quad.a | . 2 ⊢ (𝜑 → 𝐴 ∈ ℂ) | |
2 | quad.z | . 2 ⊢ (𝜑 → 𝐴 ≠ 0) | |
3 | quad.b | . 2 ⊢ (𝜑 → 𝐵 ∈ ℂ) | |
4 | quad.c | . 2 ⊢ (𝜑 → 𝐶 ∈ ℂ) | |
5 | quad.x | . 2 ⊢ (𝜑 → 𝑋 ∈ ℂ) | |
6 | quad.d | . . . 4 ⊢ (𝜑 → 𝐷 = ((𝐵↑2) − (4 · (𝐴 · 𝐶)))) | |
7 | 3 | sqcld 14180 | . . . . 5 ⊢ (𝜑 → (𝐵↑2) ∈ ℂ) |
8 | 4cn 12348 | . . . . . 6 ⊢ 4 ∈ ℂ | |
9 | 1, 4 | mulcld 11278 | . . . . . 6 ⊢ (𝜑 → (𝐴 · 𝐶) ∈ ℂ) |
10 | mulcl 11236 | . . . . . 6 ⊢ ((4 ∈ ℂ ∧ (𝐴 · 𝐶) ∈ ℂ) → (4 · (𝐴 · 𝐶)) ∈ ℂ) | |
11 | 8, 9, 10 | sylancr 587 | . . . . 5 ⊢ (𝜑 → (4 · (𝐴 · 𝐶)) ∈ ℂ) |
12 | 7, 11 | subcld 11617 | . . . 4 ⊢ (𝜑 → ((𝐵↑2) − (4 · (𝐴 · 𝐶))) ∈ ℂ) |
13 | 6, 12 | eqeltrd 2838 | . . 3 ⊢ (𝜑 → 𝐷 ∈ ℂ) |
14 | 13 | sqrtcld 15472 | . 2 ⊢ (𝜑 → (√‘𝐷) ∈ ℂ) |
15 | 13 | sqsqrtd 15474 | . . 3 ⊢ (𝜑 → ((√‘𝐷)↑2) = 𝐷) |
16 | 15, 6 | eqtrd 2774 | . 2 ⊢ (𝜑 → ((√‘𝐷)↑2) = ((𝐵↑2) − (4 · (𝐴 · 𝐶)))) |
17 | 1, 2, 3, 4, 5, 14, 16 | quad2 26896 | 1 ⊢ (𝜑 → (((𝐴 · (𝑋↑2)) + ((𝐵 · 𝑋) + 𝐶)) = 0 ↔ (𝑋 = ((-𝐵 + (√‘𝐷)) / (2 · 𝐴)) ∨ 𝑋 = ((-𝐵 − (√‘𝐷)) / (2 · 𝐴))))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 206 ∨ wo 847 = wceq 1536 ∈ wcel 2105 ≠ wne 2937 ‘cfv 6562 (class class class)co 7430 ℂcc 11150 0cc0 11152 + caddc 11155 · cmul 11157 − cmin 11489 -cneg 11490 / cdiv 11917 2c2 12318 4c4 12320 ↑cexp 14098 √csqrt 15268 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1791 ax-4 1805 ax-5 1907 ax-6 1964 ax-7 2004 ax-8 2107 ax-9 2115 ax-10 2138 ax-11 2154 ax-12 2174 ax-ext 2705 ax-sep 5301 ax-nul 5311 ax-pow 5370 ax-pr 5437 ax-un 7753 ax-cnex 11208 ax-resscn 11209 ax-1cn 11210 ax-icn 11211 ax-addcl 11212 ax-addrcl 11213 ax-mulcl 11214 ax-mulrcl 11215 ax-mulcom 11216 ax-addass 11217 ax-mulass 11218 ax-distr 11219 ax-i2m1 11220 ax-1ne0 11221 ax-1rid 11222 ax-rnegex 11223 ax-rrecex 11224 ax-cnre 11225 ax-pre-lttri 11226 ax-pre-lttrn 11227 ax-pre-ltadd 11228 ax-pre-mulgt0 11229 ax-pre-sup 11230 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1539 df-fal 1549 df-ex 1776 df-nf 1780 df-sb 2062 df-mo 2537 df-eu 2566 df-clab 2712 df-cleq 2726 df-clel 2813 df-nfc 2889 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3377 df-reu 3378 df-rab 3433 df-v 3479 df-sbc 3791 df-csb 3908 df-dif 3965 df-un 3967 df-in 3969 df-ss 3979 df-pss 3982 df-nul 4339 df-if 4531 df-pw 4606 df-sn 4631 df-pr 4633 df-op 4637 df-uni 4912 df-iun 4997 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5582 df-eprel 5588 df-po 5596 df-so 5597 df-fr 5640 df-we 5642 df-xp 5694 df-rel 5695 df-cnv 5696 df-co 5697 df-dm 5698 df-rn 5699 df-res 5700 df-ima 5701 df-pred 6322 df-ord 6388 df-on 6389 df-lim 6390 df-suc 6391 df-iota 6515 df-fun 6564 df-fn 6565 df-f 6566 df-f1 6567 df-fo 6568 df-f1o 6569 df-fv 6570 df-riota 7387 df-ov 7433 df-oprab 7434 df-mpo 7435 df-om 7887 df-2nd 8013 df-frecs 8304 df-wrecs 8335 df-recs 8409 df-rdg 8448 df-er 8743 df-en 8984 df-dom 8985 df-sdom 8986 df-sup 9479 df-pnf 11294 df-mnf 11295 df-xr 11296 df-ltxr 11297 df-le 11298 df-sub 11491 df-neg 11492 df-div 11918 df-nn 12264 df-2 12326 df-3 12327 df-4 12328 df-n0 12524 df-z 12611 df-uz 12876 df-rp 13032 df-seq 14039 df-exp 14099 df-cj 15134 df-re 15135 df-im 15136 df-sqrt 15270 df-abs 15271 |
This theorem is referenced by: dcubic 26903 quad1 47544 requad01 47545 requad1 47546 requad2 47547 itsclc0yqsol 48613 |
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