Question

1) Resolva as equações exponenciais: a) 2 x = 128 b) 3 2x-18 = 81 c) (125)x = 512 d) 7 x = 49 e) 3 5x-17 = 27

Answer 1

2ˣ = 128

2ˣ = 2⁷ => x=7

3²ˣ-¹⁸ = 81

3²ˣ-¹⁸ = 3⁴

2x-18=4

2x=22 => x=11

125ˣ = 512 ???????

7ˣ = 49

7ˣ = 7² => x=2

3⁵ˣ-¹⁷ = 27

3⁵ˣ-¹⁷ = 3³

5x-17= 3

5x=20 => x=4