Question

как решать x^2 +11x = -28

Answer 1

через дискриминант
x^2 +11x+28 =0 
D=121-4-28=9
d=3
x1=(-11+3)/2=-3
x2=(-11-3)/2=-5

Answer 2

x^2+11x+28=0
a=1 b=11 c=28
D= b^2-4ac= 121-112=9
x1= -b+√D/2a = -11+3/2=-8/2=-4
x2= -b-√D/2a = -11-3/2= --7