x2−6x−20=7𝑥2−6𝑥−20=7 Type the answer in the box below.x=𝑥= or x=𝑥= Show your reasoning.
Question
x2−6x−20=7𝑥2−6𝑥−20=7 Type the answer in the box below.x=𝑥= or x=𝑥= Show your reasoning.
Solution
Primero, vamos a simplificar la ecuación dada:
x² - 6x - 20 = 7
Restamos 7 de ambos lados para igualar la ecuación a cero:
x² - 6x - 20 - 7 = 0
Simplificamos:
x² - 6x - 27 = 0
Ahora, utilizamos la fórmula cuadrática para resolver la ecuación. La fórmula cuadrática es:
x = (-b ± √(b² - 4ac)) / 2a
En nuestra ecuación, a = 1, b = -6, y c = -27. Sustituimos estos valores en la fórmula:
x = (6 ± √((-6)² - 4(1)(-27))) / 2(1)
Calculamos el discriminante:
(-6)² - 4(1)(-27) = 36 + 108 = 144
Sustituimos el valor del discriminante en la fórmula:
x = (6 ± √144) / 2
Calculamos la raíz cuadrada de 144:
√144 = 12
Entonces, tenemos dos soluciones:
x = (6 + 12) / 2 = 18 / 2 = 9
x = (6 - 12) / 2 = -6 / 2 = -3
Por lo tanto, las soluciones son:
x = 9 o x = -3
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