Question

resolva as inequações exponenciais

Answer 1

3)

3^{x-5} > 81

3^{x-5} > 3^4

x - 5 > 4

x > 9

S = {x ∈ R | x > 9}

4)

7×2^{3x} ≤ 56

7×2^{3x} ≤ 8×7

2^{3x} ≤ 8

2^{3x} ≤ 2^{3}

3x ≤ 3

x ≤ 1

S = {x ∈ R | x ≤ 1}