Răspuns:
#X = - (1 + sqrt (617)) / 14or- (1-sqrt (617)) / 14 #
# x = -1,846 sau 1,702 #
Explicaţie:
Dat # Ax ^ 2 + bx + c #, zerourile sunt date de:
#X = (- b + -sqrt (b ^ 2-4ac)) / (2a) #
# A = -7 #
# B = -1 #
# C = 22 #
# X = (1 + -sqrt ((- 1) ^ 2-4 (-7) (22))) / (2 (-7)) #
# X = (1 + -sqrt (1 + 616)) / - 14 #
#X = - (1 + -sqrt (617)) / 14 #
#X = - (1 + sqrt (617)) / 14or- (1-sqrt (617)) / 14 #
# x = -1,846 sau 1,702 #