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y = 10 - 2x² = -2(x² - 5)
y = -2(x + √5)(x - √5)
b)
y = ¹/₃ x² + ¹/₆ x
y = ¹/₃ x(x + ¹/₂)
1.
y = 4x(x + 6)
y = 0
4x(x + 6) = 0
4x = 0 v x + 6 = 0
x = 0 v x = -6
x ∈ {-6; 0}
2.
y = -2(x + 1)(x +1 - √2)
y = 0
x + 1 = 0 v x + 1 - √2
x = -1 v x = √2 - 1
x ∈ {-1; √2-1}
3.
y = (x + 2 - √3)(x - 3 + √2)
y = 0
x + 2 - √3 = 0 v x - 3 + √2 = 0
x = √3 - 2 v x = 3 - √2
x ∈ {√3-2; 3-√2}