Ayudemen en matemáticas en ecuaciones cuadráticax2 - 3x - 4 = 0x2 - 9x + 8 = 0x2 - x - 2 = 0?

X² - 3X - 4 = 0 - - - > Resolvemos por formula ecuación cuadrática

Terminos

a = 1

b = - 3

c = - 4

<img src="https://tex.z-dn.net/?f=X%3D%20%5Cdfrac%7B-b%2B-%20%5Csqrt%7Bb%5E2-4ac%7D%20%7D%7B2a%7D%20%5C%5C%20%5C%5C%20X%3D%5Cdfrac%7B-%28-3%29%2B-%20%5Csqrt%7B%28-3%29%5E2-4%281%29%28-4%29%7D%20%7D%7B2%281%29%7D%20%5C%5C%20%5C%5C%20X%3D%5Cdfrac%7B3%2B-%20%5Csqrt%7B9%2B16%7D%20%7D%7B2%7D%20%5C%5C%20%5C%5C%20X%3D%5Cdfrac%7B3%2B-%20%5Csqrt%7B25%7D%20%7D%7B2%7D%20%5C%5C%20%5C%5C%20X_1%3D%5Cdfrac%7B3%2B5%20%7D%7B2%7D%3D%20%5Cdfrac%7B8%7D%7B2%7D%20%3D%204%20%5C%5C%20%5C%5C%20X_2%3D%5Cdfrac%7B3-%205%7D%7B2%7D%3D%20%5Cdfrac%7B-2%7D%7B2%7D%20%3D%20-1" />

X² - 9X + 8 = 0

Terminos

a = 1

b = - 9

c = 8

<img src="https://tex.z-dn.net/?f=X%3D%20%5Cdfrac%7B-b%2B-%20%5Csqrt%7Bb%5E2-4ac%7D%20%7D%7B2a%7D%20%5C%5C%20%5C%5C%20X%3D%5Cdfrac%7B-%28-9%29%2B-%20%5Csqrt%7B%28-9%29%5E2-4%281%29%288%29%7D%20%7D%7B2%281%29%7D%20%5C%5C%20%5C%5C%20X%3D%5Cdfrac%7B9%2B-%20%5Csqrt%7B81-32%7D%20%7D%7B2%7D%20%5C%5C%20%5C%5C%20X%3D%5Cdfrac%7B9%2B-%20%5Csqrt%7B49%7D%20%7D%7B2%7D%20%5C%5C%20%5C%5C%20X_1%3D%5Cdfrac%7B9%2B%207%7D%7B2%7D%3D%20%5Cdfrac%7B16%7D%7B2%7D%20%3D%208%20%5C%5C%20%5C%5C%20X_2%3D%5Cdfrac%7B9-7%7D%7B2%7D%3D%20%5Cdfrac%7B2%7D%7B2%7D%20%3D%201" />

X² - X - 2 = 0

Terminos

a = 1

b = - 1

c = - 2

<img src="https://tex.z-dn.net/?f=X%3D%20%5Cdfrac%7B-b%2B-%20%5Csqrt%7Bb%5E2-4ac%7D%20%7D%7B2a%7D%20%5C%5C%20%5C%5C%20X%3D%5Cdfrac%7B-%28-1%29%2B-%20%5Csqrt%7B%28-1%29%5E2-4%281%29%28-2%29%7D%20%7D%7B2%281%29%7D%20%5C%5C%20%5C%5C%20X%3D%5Cdfrac%7B1%2B-%20%5Csqrt%7B1%2B8%7D%20%7D%7B2%7D%20%5C%5C%20%5C%5C%20X%3D%5Cdfrac%7B1%2B-%20%5Csqrt%7B9%7D%20%7D%7B2%7D%20%5C%5C%20%5C%5C%20X_1%3D%5Cdfrac%7B1%2B3%7D%7B2%7D%3D%20%5Cdfrac%7B4%7D%7B2%7D%20%3D%202%20%5C%5C%20%5C%5C%20X_2%3D%5Cdfrac%7B1-%203%7D%7B2%7D%3D%20%5Cdfrac%7B-2%7D%7B2%7D%20%3D%20-1" />

Saludos desde Venezuela.