Предмет: Алгебра, автор: inna555555555

Помогите Решить срочно Плиз!
х² - 4х-5=0
х ²+7х+12=0
х²-11х+10=0
2х²-3х+1=0
Помогите хотябы несколько примеров решить.

Ответы

Автор ответа: m11m

1) x²-4x-5=0
D=16+20=36
x₁= 4-6 = -1
2
x₂= 4+6 = 5
2
Ответ: -1; 5.

2) x²+7x+12=0
D=49-48=1
x₁= -7-1 = -4
2
x₂ = -7+1 = -3
2
Ответ: -4; -3.

3) x²-11x+10=0
D=121-40=81
x₁= 11-9 = 1
2
x₂ = 11+9 =10
2
Ответ: 1; 10.

4) 2х²-3х+1=0
D=9-8=1
x₁= 3-1= 1/2
4
x₂ = 3+1 =1
4
Ответ: 1/2; 1.

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