Question

решите уравнение x^2+4x=5

Answer 1

X^2 + 4x = 5
X^2 + 4x - 5 = 0
D = 16 + 20 = 36 ; V D = 6
X1 = ( - 4 + 6 ) : 2 = 1
X2 = ( - 4 - 6 ) : 2 = - 5
Ответ 1 ; - 5

Answer 2

x^2+4x-5=0
D=b^2-4ac=16+20=36
x(1;2)=-b(+-)(sqrt)D/2a
x=1
x=-5