7|2x-7|=21

Lösung

7 ∣ 2 x - 7 ∣ = 21

x = 2 or x = 5

Schritte zur Lösung

7 ∣ 2 x - 7 ∣ = 21

Teile beide Seiten durch

7

∣ 2 x - 7 ∣ = 3

Wende Absoluteregel an: Wenn

∣ u ∣ = a, a > 0

dann

u = a

u = - a

2 x - 7 = - 3 or 2 x - 7 = 3

2 x - 7 = - 3 or 2 x - 7 = 3

x = 2 or x = 5

5 x + 3 \geq 8 x - 1

r^{2} - 4 r - 91 = 7

3 y^{2} + 5 y = 12

(x + 6) (4 x - 7) = 0

∣ x - 9 ∣ = - 3