Odgovor:
# A = (0,50) #
korenine:
# B = (5sqrt (2) * i, 0) #
#C = (- 5sqrt (2) * i, 0) #
# (0,0) min #
Pojasnilo:
#f _ ((x)) = x ^ 2 + 50 #
#f _ ((0)) = (0) ^ 2 + 50 = 50 #
#f_ (x) = 0 #
# => x ^ 2 + 50 = 0 #
# => x ^ 2 = -50 #
# => x = + - sqrt (-50) #
# (sqrt (50) = sqrt (25 * 2) = sqrt (25) * sqrt (2) = 5 * sqrt (2))) #
# => x = + - 5sqrt (2) * i #
Tako dobro, saj imamo #(0,50)# IN # (+ - 5sqrt (2) * i, 0) #
Zdaj bomo preverili, če imamo max / min
Ker #a> 0 # # (a * x ^ 2 + 50) # funkcija "nasmeh":)
Torej imamo min
#f '_ ((x)) = 2 * x #
#f '_ ((x)) = 0 #
# => 2 * x = 0 #
# => x = 0 #
Torej, imamo #(0,50)# IN # (+ - 5sqrt (2) * i, 0) # IN # (0,0) min #