Question

va rog repede dau inima și 5 stele​

Answer 1

 

$\displaystyle\bf\\c)\\\\9^{2\cdot x}=81^4\\\\9^{2\cdot x}=\big(9^2\big)^4\\\\9^{2\cdot x}=9^{2\cdot4}\\\\2\cdot x=2\cdot4~~\Big|:2\\\\\boxed{\bf x=4}\\\\\\d)\\\\8^{3\cdot x}=64^3\\\\8^{3\cdot x}=8^{2\cdot 3}\\\\3\cdot x=2\cdot 3~~~\Big|~:3\\\\\boxed{\bf x=2}$

 

 

Answer 2

Răspuns:

Explicație pas cu pas:

c) 9²ˣ=81⁴  ⇒(3²)²ˣ=(3⁴)⁴  ⇒3⁴ˣ=3¹⁶  ⇒4x=16  ⇒x=4

d) 8³ˣ=64³  ⇒(2³)³ˣ=(2⁶)³  ⇒2⁹ˣ=2¹⁸  ⇒9x=18  ⇒x=2