Question

Tìm x

(2x+1)⁵ = (2x+1)⁷

Answer 1

(2x + 1)⁵ = (2x + 1)⁷

TH1:

2x + 1 = 0

2x = -1

x = -1/2

TH2:

2x + 1 = 1

2x = 1 - 1

2x = 0

x = 0

TH3:

2x + 1 = -1

2x = -1 - 1

2x = -2

x = -2 : 2

x = -1

Vậy x = -1 hoặc x = 0 hoặc x = -1/2

Answer 2

^{_{(2x + 1)^5 = (2x + 1)^7}}

^_TH1:

^{_{2x + 1 = 0}}

^{_{2x = -1}}

^{_{x = -1/2}}

^_TH2:

^{_{2x + 1 = 1}}

^{_{2x = 1 - 1}}

^{_{2x = 0}}

^{_{x = 0}}

^_TH3:

^{_{2x + 1 = -1}}

^{_{2x = -1 - 1}}

^{_{2x = -2}}

^{_{x = -2 : 2}}

^{_{x = -1}}

^{_{Vậy x = -1 hoặc x = 0 hoặc x = -1/2}}