1). x² = 10 x₁ = √10 x₂ = -√10
2). x² = 20 x₁ = 2√5 x₂ = -2√5
3). x² = 18 x₁ = 3√2 x₂ = -3√2
4). x² = 121 x₁ = 11 x₂ = -11
5). x² = 490 x₁ = 7√10 x₂ = -7√10
6). x² = 1000 x₁ = 10√10 x₂ = -10√10
7). x² = 4000 x₁ = 20√10 x₂ = -20√10
1)100/100-15/100:(11/12-3/4)=85/100:((11-9)/12)=85/100*6=510/100=5,1
X²+p=x
x²-x+p=0
D=1-4p=0
p=1/4
y=x²+1/4
Парабола с вершиной в точке (0;1/4)
(2x + 3)(x + 1) ≤ x^2 + 9
x^2 + 2x + 3x + 3 ≤ x^2 + 9
x^2 + 5x + 3 ≤ x^2 + 9
x^2 + 5x + 3 - x^2 + 9 ≤ 0
x^2 + 6x - x - 6 ≤ 0
x(x + 6) - (x + 6) ≤ 0
(x + 6)(x - 1) ≤ 0
x + 6 ≤ 0 ; x - 1 ≥ 0
x + 6 ≥ 0 ; x - 1 ≤ 0
x∈[ - 6 ; 1]
