Question

9 ˣ ⁻=27 e: 2ˣ²- ¹²= 8/1 e mais: (5 /4) ˣ =16/25
3²ˣ⁺¹=√27
por fv.

Answer 1

9 - ˣ ⁻=27

3^-2x=3^3 => -2x=3 ==> x= -3/2

2ˣ²- ¹²= 1/8

2^x²-12=2-³ => x²-12=-3 => x²=9 => x=±3

(5 /4) ˣ =16/25

(5/4)^x = (5/4)^-2 ===> x = -2

3²ˣ⁺¹=√3³

3^2x+1 = 3^3/2

2x+1 = 3/2

4x+2 = 3

4x = 1

x = 1/4