Question

Cho  thì giá trị của  là

 

Answer 1

3 ^ x + 2 = 81

3^x+2 = 3^4

=> x + 2 = 4

     x = 4 - 2

     x = 2

Answer 2

\(3^{x+2}=81\)

\(\Leftrightarrow3^{x+2}=3^4\)

\(\Leftrightarrow x+2=4\)

\(\Leftrightarrow x=2\left(tm\right)\)

Vậy ..

Answer 3

cảm ơn mn

Answer 4

3 ^{x + 2} = 81

3 ^{x + 2}  = 3⁴

=> x + 2 = 4

x = 4 - 2

x = 2

Answer 5

3z+2=81

3z=81-2

z=79:3

Z=26

Answer 6

\(3^{x+2}=81\)

\(\Leftrightarrow3^{x+2}=3^4\)

\(\Leftrightarrow x+2=4\)

\(\Leftrightarrow x=4-2\)

\(\Leftrightarrow x=2\)

vậy giá trị của x=2

Answer 7

3^x+2 = 81

3^x+2 = 3⁴

=> x + 2 = 4

     x       = 4 - 2 

     x       = 2

Answer 8

3^{x + 2}  = 81

<=> 3^x+2 = 3⁴

<=. x+2 = 4

<=> x = 2

Answer 9

3^x+2 = 81

3^x+2 = 3⁴ 

=> x = 4 - 2

     x = 2

Answer 10

\(3^{x+2}=81\)
\(\Rightarrow3^{x+2}=3^4\)
\(\Rightarrow x+2=4\)
\(\Rightarrow x=4-2\)
\(\Rightarrow x=2\)

Answer 11

3^x+2=81

=> 3^x+2=3⁴

=> x+2=4

=>x=4-2

=>x=2