Kakšni so x-preseči enačbe f (x)) = 3x ^ 2 + 10x-8?

Odgovor:

x - prestreženi so #(2/3,0)# in #(-4,0)#

Pojasnilo:

Glede na -

#f (x) = 3x ^ 2 + 10x-8 #

# y = 3x ^ 2 + 10x-8 #

Put # y = 0 #

# 3x ^ 2 + 10x-8 = 0 #

# 3x ^ 2-2x + 12x-8 = 0 #

#x (3x-2) +4 (3x-2) = 0 #

# (3x-2) (x + 4) = 0 #

# 3x-2 = 0 #

# x = 2/3 #

# x + 4) = 0 #

# x = -4 #

x - prestreženi so #(2/3,0)# in #(-4,0)#