" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
Liczba pierwiastkowana musi być nieujemna:
√(x² + 6x + 9) ≥ 0
(x + 3)² ≥ 0
x + 3 ≥ 0
x ≥ -3
√(x² + 6x + 9) = 1
√(x + 3)² = 1 ()²
(x + 3)² = 1
x² + 6x + 9 - 1 = 0
x² + 6x + 8 = 0
Δ = 36 - 32 = 4
√Δ = 2
x₁ = (-6-2)/2 = -4 ∉ D
x₂ = (-6+2/2 = -2
x = -2