Calculadora Lei de Bhaskara & Equações do 2º Grau
Calculadora online da Lei de Bhaskara: Resolva equações do segundo grau passo a passo com cálculo do discriminante Delta (Δ), raízes reais e coordenadas do vértice.
Nota: Você pode usar vírgula (,) ou ponto (.) como separador decimal.
Explicação Matemática
Eine quadratische Gleichung ist eine algebraische Gleichung zweiten Grades der allgemeinen Form:
Die Mitternachtsformel (abc-Formel):
Zur universellen Lösung dient die abc-Formel:
Der Term unter der Wurzel, D = b² - 4ac, wird als Diskriminante bezeichnet:
- D > 0: Es gibt zwei verschiedene reelle Lösungen (zwei Nullstellen).
- D = 0: Es gibt genau eine reelle Lösung (eine doppelte Nullstelle / Berührpunkt).
- D < 0: Es gibt keine reellen Nullstellen (zwei konjugiert komplexe Lösungen).
Origem Histórica e o Desafio Resolvido
Por que esta matemática foi desenvolvida, de onde veio e que problema real resolveu?
1. Land Surveying, Field Allocation & Inheritance
Builders and administrators in ancient Babylon and Egypt faced the practical challenge of dividing rectangular plots with fixed area and perimeter constraints. Additionally, 9th-century Islamic inheritance law required exact quadratic calculations to distribute complex estates among heirs.
2. Geometric Completing the Square
In 820 CE, Muhammad ibn Musa al-Khwarizmi authored "Al-Kitab al-muhtasar fi hisab al-gabr wal-muqabala" (the origin of the word algebra). He systematically solved quadratic equations by geometrically completing squares, which eventually evolved into the quadratic formula.
3. Ballistics, Architecture & Physics
Every projectile trajectory, satellite dish design (parabolic reflectors), and suspension bridge cable precisely follows quadratic equations.
Aplicações no Mundo Real e Casos Práticos
Por que aprendemos isso? Veja como essa matemática é aplicada na economia, engenharia, ciência e no dia a dia:
Projectile Trajectories & Ballistics
Every thrown or propelled object (basketball, artillery shell, rocket) follows a parabolic path y = ax² + bx + c influenced by gravity.
The parabola vertex S(d | e) defines maximum flight altitude, while positive roots pinpoint exact landing locations.
Satellite Dishes & Suspension Bridges
Parabolic reflectors focus incoming parallel satellite signals directly onto the focal receiver. Suspension bridge main cables hang in parabolas.
Satellite dishes utilize parabolic geometry to focus weak radio signals from orbit directly onto the LNB antenna head.
Price Optimization & Maximum Revenue
Revenue curves are quadratic: raising prices reduces consumer demand. The vertex pinpoint the optimum price that maximizes total revenue.
A software provider finds via parabolic modeling that a $19.90 monthly subscription yields peak monthly revenue.
Perguntas Frequentes (FAQ)
O que indica o valor do discriminante Delta (Δ)?
Se Δ > 0, a equação tem duas raízes reais distintas. Se Δ = 0, tem uma raiz real única (raiz dupla). Se Δ < 0, tem duas raízes complexas conjugadas.
Como calcular o vértice de uma parábola?
A coordenada x do vértice é dada por x = -b / (2a).