|2x+9|=5

Lösung

∣ 2 x + 9 ∣ = 5

x = - 7 or x = - 2

Schritte zur Lösung

∣ 2 x + 9 ∣ = 5

Wende Absoluteregel an: Wenn

∣ u ∣ = a, a > 0

dann

u = a

u = - a

2 x + 9 = - 5 or 2 x + 9 = 5

2 x + 9 = - 5 or 2 x + 9 = 5

x = - 7 or x = - 2

- 4 k + 2 (5 k - 6) = - 3 k - 39

5 = - x^{2} + 10 x - 21

r^{2} + 2 r - 8 = 0

- 5 x < 25

s im pl i f y 2 0^{- 8} \cdot 2 0^{8}