a^2=21

Lösung

a^{2} = 21

a = 21, a = - 21

Dezimale

a = 4.58257 \dots, a = - 4.58257 \dots

Schritte zur Lösung

a^{2} = 21

Für

x^{2} = f (a)

sind die Lösungen

x = f (a), - f (a)

a = 21, a = - 21

- x^{2} + 7 x + 12 = 0

2 (x + 3) - x^{2} - 3 x = 0

12 x^{2} - 36 x = - 27

520 = 3 (x - 3) (2.1 x - 3)

x^{2} + 7 x - 20 = 0