4x² + 1 = 0 a = 4 | b = 0 | c = 1
D = b² - 4ac = 0 - 4 * 4 * 1 = 0 - 16 = -16 < 0, корней нет
2m² - 3m = 8 -3m
2m² - 3m - 8 + 3m = 0
2m² - 8 = 0 a = 2 | b = 0 | c = -8
D = b² - 4ac = 0 - 4 * 2 * (-8) = -64 < 0, нет корней
3x² - 4x = 0 a = 3 | b = -4 | c = 0
D = b² - 4ac = 16 - 4 * 3 * 0 = 16 > 0, 2 корня
x₁ = -b + √D/2a = 4 + 4/6 = 8/6 = 4/3
x₂ = -b - √D/2a = 4 - 4/6 = 0/6 = 0
4x² - 9 = 0 a = 4 | b = 0 | c = -9
D = b² - 4ac = 0 - 4 * 4 * (-9) = 144 > 0, 2 корня
x₁ = -b + √D/2a = 0 + 12/8 = 12/8 = 3/2 = 1,5
x₂ = -b - √D/2a = 0 - 12/8 = -12/8 = -3/2 = -1,5
отметь как лучший!
- интервал (0; 3) принадлежит этому множеству, и функция там непрерывна.
8x +6x-48=232
l4× =232+48
x=20
20x=6o(x-1)
20x=60×-60
6o =60×-2Ox
X=60: 40
x= l,5
lo(8x-3) -7 ( 3×+l)=2×70
8Ox -30 -21 × -7 =140
59x= 140+37
x= 177: 59
x=3
2(2×-3)+1(7×-13)+3(5-2 x) =6(x-1)
4x-6+7-x-13+15-6 x =6x-6
5× - 4=6 x-6
-x=-2
x=2
2(x^2-3×-1) -1(2 x^2 +3x -5) = 3
2X^2 - 6x -2-2x^'2-3x+5=3
- 9x=3-5+2
-9 x=0
X=0