a) Bestimme rechnerisch die Nullstellen der Funktionen und gib die zugehörigen Punkte an.
I.
x^2 - 3·x - 10 = 0 --> x = -2 ∨ x = 5
x + 2 = 0 --> x = -2
II.
0.25·x^2 - 1 = 0 --> x = -2 ∨ x = 2
2·x^2 + 2·x - 12 = 0 --> x = -3 ∨ x = 2
III.
-2·x^2 + 4·x + 6 = 0 --> x = -1 ∨ x = 3
-0.5·x - 8 = 0 --> x = -16
IV.
-x^2 + 3·x + 10 = 0 --> x = -2 ∨ x = 5
0.5·x^2 + 3·x - 3.5 = 0 --> x = -7 ∨ x = 1
b) Ermittle rechnerisch und zeichnerisch die Schnittpunkte der beiden Funktionen.
I.
x^2 - 3·x - 10 = x + 2 --> x = -2 ∨ x = 6 --> (-2 | 0) ; (6 | 8)
II.
0.25·x^2 - 1 = 2·x^2 + 2·x - 12 --> x = -22/7 ∨ x = 2 --> (-22/7 | 72/49) ; (2 | 0)
III.
-2·x^2 + 4·x + 6 = -0.5·x - 8 --> x = -7/4 ∨ x = 4 --> (-7/4 | -57/8) ; (4 | -10)
IV.
-x^2 + 3·x + 10 = 0.5·x^2 + 3·x - 3.5 --> x = -3 ∨ x = 3 --> (-3 | -8) ; (3 | 10)