|3x+9|=21

Lösung

∣ 3 x + 9 ∣ = 21

x = - 10 or x = 4

Schritte zur Lösung

∣ 3 x + 9 ∣ = 21

Wende Absoluteregel an: Wenn

∣ u ∣ = a, a > 0

dann

u = a

u = - a

3 x + 9 = - 21 or 3 x + 9 = 21

3 x + 9 = - 21 or 3 x + 9 = 21

x = - 10 or x = 4

- 15 = - 5 ∣ b + 8 ∣

x^{2} - 6 ∣ x ∣ + 8 = 0

5 ∣ u - 2 ∣ + 15 = 90

∣ 2 x + 2 ∣ + x - 1 = - 7

- 9 = - 9 ∣ u ∣ - 2