Verified answer

1)  X^2+11x+24=0

D= 11^2-4*24= 25  в корне= 5

x1= (11-5)/2=3

x2= (11+5)/2=8

2) x^2+x=56

x^2+x-56=0

D=1+4*56=  225 =15

x1= (1-15)/2=-7

x2(1+15)/2=8

3) x^2-x=2

x^2-x-2=0

D=1+4*2=9=3

x1=(1-3)/2=-1

x2=(1+3)/2=2

4) x^2-4x=5

x^2-4x-5=0

D=4^2+4*5=36=6

x1=(-4-6)/2=-5

x2=(-4+6)/2=1