Question

tim x

a) 2^x.4 = 128

b) x¹⁵ = x

c) [2x + 1]³ = 125

Answer 1

a) 2^x . 4 = 128

2^x = 128 : 4

2^x = 32

2^x = 2⁵  (vì 32 = 2⁵)

x = 5

b) x¹⁵ = x

x¹⁵ - x = 0

x.(x¹⁴ -1) =0

x = 0 hoặc x¹⁴ = 1

x = 0 hoặc x = 1 hoặc x = -1

c) [2x + 1]³ = 5³ (vì 125 = 5³)

2x + 1 = 5

x = (5 - 1)/2

x = 2

Answer 2

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Answer 3

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