20=|a-9|

Lösung

20 = ∣ a - 9 ∣

a = - 11 or a = 29

Schritte zur Lösung

20 = ∣ a - 9 ∣

Tausche die Seiten

∣ a - 9 ∣ = 20

Wende Absoluteregel an: Wenn

∣ u ∣ = a, a > 0

dann

u = a

u = - a

a - 9 = - 20 or a - 9 = 20

a - 9 = - 20 or a - 9 = 20

a = - 11 or a = 29

∣ - 4 - r ∣ = 4

∣ 11 x + 10 ∣ = 22

∣ - 4 x ∣ = 28

∣ - 4 x ∣ = 36

x^{2} + 7 x - 1 = ∣ x + 2 ∣ + 9