Question

помогите с решением
2x(x-1)≤-√28(x-1)

Answer 1

2x^2-2x≤-√28*x+√28
2x^2+(√28-2)х-√28≤0
y=2x^2+(√28-2)х-√28
y=0
2x^2+(√28-2)х-√28=0
x=1 ; x=-√7
x∈[-∞;-√7]