## [x – 5] mũ 4 = [x-5] mũ 5

Question

[x – 5] mũ 4 = [x-5] mũ 5

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1 year 2020-10-22T13:42:14+00:00 2 Answers 92 views 0

1. (x – 5)^4 = (x – 5)^5

(x – 5)^4 – (x – 5)^5 = 0

(x – 5)^4 . [1 – (x – 5)] = 0

Xét 2 TH:

+) TH1: (x – 5)^4 = 0

x – 5 = 0

x = 5

+) TH2: 1 – (x – 5) = 0

x – 5 = 1

x = 6

Vậy x = 5 hoặc x = 6

2. (x – 5)^4 = (x – 5)^5

↔ x – 5 = 0 hoặc x – 5 = 1

↔ x = 5 hoặc x = 6

Vậy x = 5 hoặc x = 6