93.9k views
2 votes
Solve 81x = 27x + 2.

x = 1
x = 2
x = 5
x = 6

User Chad K
by
6.0k points

2 Answers

0 votes

Answer: x = 6

Explanation: got it right on the test

User Aaron Taveras
by
6.6k points
3 votes

Answer: x = 6

Explanation:

Let's solve your equation step-by-step.

81x=27x+2

Solve Exponent.

81x=27x+2

log(81x)=log(27x+2)(Take log of both sides)

x*(log(81))=(x+2)*(log(27))

x=(

log(27)

log(81)

)*(x+2)

x=0.75*(x+2)

x=0.75x+1.5(Simplify both sides of the equation)

x−0.75x=0.75x+1.5−0.75x(Subtract 0.75x from both sides)

0.25x=1.5

0.25x

0.25

=

1.5

0.25

(Divide both sides by 0.25)

x=6

User Cristian Tr
by
7.4k points