" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
x² + 6x + 9 + 5x² + x² - 4x + 4 ≤ 0
7x² - 2x + 13 ≤ 0
Δ = b² - 4ac
Δ = (-2)² - 4*13*7 = 4 -364 = - 360
x ∈ Ф