Rozwiąż równanie wielomianowe: 2x3 + 7x2 + 7x + 2=0 (metoda grupowania wyrazów)

    2x³ + 7x² + 7x + 2 = 0   2x³ + 2 + 7x² + 7x = 0 2(x³ + 1) + 7x(x + 1) = 0 2(x+1)(x² - x + 1) + 7x(x+1) = 0 (x+1)[2(x²-x+1) + 7x] = 0   x + 1 = 0 => x = -1   2x²-2x+2 + 7x = 0 2x²+5x+2 = 0     Δ = b²-4ac Δ = 5² - 4 x 2 x2 = 25 - 16 = 9 √Δ = 3   x₁ = -b - √Δ/2a x₁ = -5 - 3/2 x 2 = -8/4 = -2 x₂ = -b+√Δ/2a x₂ = -5 +3/2x2 = -0,5   x = -0,5 ∨ x = -2 ∨ x = -1         ---------------------------------------------------------------------------------------------------- Litterarum radices amarae sunt, fructus iucundiores   Pozdrawiam :)