Question

Me ajudem com esta conta pfv?

Answer 1

$3^{x} = u$

$\frac{(3^{x})^{2}+27}{4}=(3^{x})\cdot3$

u² +27 = u * 12

u² -12u +27 = 0

D₁₂ = {1 , 3 , 9 , 27}

(3) + (9) = 12

(3) * (9) = 27

$3^{x} = u$

3ˣ = 3

x = 1

3ˣ = 9

x = 2

{1 , 2}