f(x) = -12x^3 - 90x^2 + 504x + 10
f'(x) = -36x^2 - 180x + 504
f''(x) = -72x - 180
f'''(x) = -72
a)
f'(1,39) = -36*1,39^2 - 180*1,39 + 504 = 184,2444 > 0
Aussage falsch
b)
f''(-7.69) = -72*(-7.69) - 180 = 373,68 > 0
Aussage richtig
c)
konkav: f''(x) ≤ 0
f''(-8.23) = -72*(-8.23) - 180 = 412,56 > 0
Aussage falsch
d)
Sattelpunkt: f'(x) = 0 und f''(x) = 0 und f'''(x) ≠ 0
f'(2) = -36 * 4 - 180 * 2 + 504 = 0
f''(2) = -72 * 2 - 180 ≠ 0
Aussage falsch
e)
f'(0.05) = -36 * 0.05^2 - 180 * 0.05 + 504 = 494,91
Aussage falsch