Question

x(x+4)−5x−20=0
x^1=
x^2=
помогите пожалуйста!!!!​

Answer 1

$d = 1 + 4 \times 20 = 81 \\ x = \frac{1 + 9}{2} = 5 \\ x = \frac{1 - 9}{2} = - 4$