Respuestas

  • Usuario de Brainly
2014-01-14T22:50:14+01:00
28x² = 62x - 30
28x² - 62x + 30 = 0

Simplificamos:
14x² - 31x + 15 = 0

x =  \frac{31 \frac{+}{} \sqrt{(-31)^2-4*14*15}  }{2*14}

x =  \frac{31 \frac{+}{} \sqrt{961-840}  }{28}

x =  \frac{31 \frac{+}{} \sqrt{121}  }{28}

x =  \frac{31 \frac{+}{} 11 }{28}

x₁ = (31 + 11)/28 = 42/28 = 3/2
x₂ = (31 - 11)/28 = 20/28 = 5/7

Solución:
x₁ = 3/2
x₂ = 5/7