-x^2 + 2x + 1 = 3x + a
x^2 + x - 1 + a = 0
D = 1 - 4*1*(a-1)=0
1 - 4(a-1) = 0
4(a-1) = 1
a-1 = 1/4
a = 1,25
Подставляем:
-x^2 + 2x + 1 = 3x + a
x^2 + x - 1 + a = 0
D = 1 - 4*1*(a-1)=0
1 - 4(a-1) = 0
4(a-1) = 1
a-1 = 1/4
a = 1,25
Подставляем: