Question

35 баллов, пожалуйста, help

Answer 1

1.D=1-(-24)
D=25
x1,x2=1±5/2=3;-2
2.D=16-(-240)
D=256
x1,x2=4±16/4=5;-3
3.D=225-(-400)
D=625
x1;x2=-15±25/2=5;-20
4.D=25-(-24)
D=49
x1;x2=-5±7/4=0,5;-3
5.3x²-27=0
x²=27÷3
x²=9
x=3

Answer 2

1.×^2+2×-3×-6=0
×(×-2)-3(×+2)=0
(×+2)(×-3)=0
×+2=0
×-3=0
×1=-2
×2=3

2.×^2-2×-15=0
×(×+3)-5(×+3)=0
(×+3)(×-5)=0
×+3=0
×-5=0
×1=-3
×2=5

3.×^2+20×-5×-100=0
×(×+20)-5(×+20)=0
(×+20)(×-5)=0
×-5=0
×+20=0
×1=-20
×2=5

4.2×^2+6×-×-3=0
2×(×+3)-(×+3)=0
(×+3)(2×-1)=0
×+3=0
2×-1=0
×1=-3
×2=0,5

5.×^2-9=0
×^2=9
×1=3
×2=-3