Respuesta:
x² + 30x - 400 = 0
x² + 30x = 0 + 400
x² + 30x = 400
x1 : x2 = -30 ± √30² - 4 * 1 * (-400)/2 * 1
x1 : x2 = -30 ± 50/2 * 1
x1 = -30 + 50/2 * 1
x1 = 10
x2 = -30 - 50/2 * 1
x2 = -40
x = 10; x = -40
Explicación paso a paso:
tenga buen día
x^2 + 30x - 400 = 0
(x + 40)(x - 10) = 0
x + 40 = 0
x = - 40
x1 = - 40
x - 10 = 0
x = 10
x2 = 10
