โดเมนของ f (x) คืออะไร

ตอบ:

#D (ฉ) = (- OO, -3 uuu 3 OO) #

คำอธิบาย:

# i_1: (2x-1) + sqrt (x ^ 2-3) = 0 #!

# I_2: x ^ 2-3> = 0 #

#D (ฉ) = I_1nnnI_2 #

# 2x-1 + sqrt (x ^ 2-3)! = 0 #

#sqrt (x ^ 2-3)! = 1-2x #

# x ^ 2-3! = (1-2x) ^ 2 #

# x ^ 2-3 = 1-4x + 4x ^ 2 #

# 0! = 4-4x + 3x ^ 2 #

# 3x ^ 2-4x + 4 = 0 #

# "แนน" <0 #

# => i_1 = RR #

# x ^ 2-3> = 0 #

# (x-3) (x + 3)> = 0 #

# I_2 = (- OO, -3 uuu 3 OO) #

#D (ฉ) = = I_1nnnI_2 RRnnn ((- OO, -3 uuu 3 OO)) #

#D (ฉ) = (- OO, -3 uuu 3 OO) #