Dez questoes de equaçao exponencial
Soluções para a tarefa
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1
1.
3x
10 = 1000
3x 3
10 = 10
3x = 3
x = 3/3
x = 1
----------------------------------------
2.
x
4 = ∛32
x ___
4 = ∛2⁵
2x 5/3
2 = 2
2x = 5
----
3
3.2x = 5
6x = 5
x = 5/6
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
3.
x + 3
25 = 125
2(x + 3) 3
5 = 5
2.(x + 3) = 3
2x + 6 = 3
2x = 3 - 6
2x = - 3
x = - 3/2
------------------------------
4.
x
[ 1] 1
--- = --------
[ 2 ] 32
x
1 1
--- = -------
2 2⁵
x 5
[1] [ 1]
--- = ----
[2] [2 ]
x = 5
***********************************
5.
2x
( 3 ) 27
---- = -------
( 5) 125
2x
3 3³
----- = -------
5 5³
2x ¨ 3
[3] [3]
----- = -----
[ 5] [5]
2x = 3
x = 3/2
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
6.
x
4 = 1
-----
64
x
4 = 1
-----
4³
x - 3
4 = 4
x = - 3
____________________________
7.
x
3 = √3
x 1/2
3 = 3
x = 1/2
****************************
8.
x
25 = √5
2x 1/2
5 = 5
2x = 1
----
2
2.2x = 1
4x = 1
x = 1/4
""""""""""""""""""""""""""""""""
9.
3x
10 = 1
------
1000
3x
10 = 1
-------
10³
3x - 3
10 = 10
3x = - 3
x = - 3/3
x = - 1
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
10.
2x
729 = 27
[ 6 ] 2x 3
[3 ] = 3
12x = 3
x = 3 (:3) 1
----- = ------
12 (:3) 4
********************************
11.
∛ x
2 = 1
-----
16
x
----
3 - 4
2 = 2
x
---- = - 4
3
x = 3.(-4)
x = - 12
*************************************
12.
x² - 5x + 6
2 = 1
x² - 5x + 6 0
2 = 2
x² - 5x + 6 = 0
a = 1; b = - 5; c = 6
Δ = b² - 4ac
Δ = (-5)² - 4.1.6
Δ = 25 - 24
Δ = 1
x = - b +/- √Δ = - (-5) +/- √1
-------------- ----------------
2a 2.1
x = 5 + 1
-------- = 6/2 = 3
2
x = 5 - 1
------ = 4/2 = 2
2
R.: x = 3 e x = 2
3x
10 = 1000
3x 3
10 = 10
3x = 3
x = 3/3
x = 1
----------------------------------------
2.
x
4 = ∛32
x ___
4 = ∛2⁵
2x 5/3
2 = 2
2x = 5
----
3
3.2x = 5
6x = 5
x = 5/6
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
3.
x + 3
25 = 125
2(x + 3) 3
5 = 5
2.(x + 3) = 3
2x + 6 = 3
2x = 3 - 6
2x = - 3
x = - 3/2
------------------------------
4.
x
[ 1] 1
--- = --------
[ 2 ] 32
x
1 1
--- = -------
2 2⁵
x 5
[1] [ 1]
--- = ----
[2] [2 ]
x = 5
***********************************
5.
2x
( 3 ) 27
---- = -------
( 5) 125
2x
3 3³
----- = -------
5 5³
2x ¨ 3
[3] [3]
----- = -----
[ 5] [5]
2x = 3
x = 3/2
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
6.
x
4 = 1
-----
64
x
4 = 1
-----
4³
x - 3
4 = 4
x = - 3
____________________________
7.
x
3 = √3
x 1/2
3 = 3
x = 1/2
****************************
8.
x
25 = √5
2x 1/2
5 = 5
2x = 1
----
2
2.2x = 1
4x = 1
x = 1/4
""""""""""""""""""""""""""""""""
9.
3x
10 = 1
------
1000
3x
10 = 1
-------
10³
3x - 3
10 = 10
3x = - 3
x = - 3/3
x = - 1
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
10.
2x
729 = 27
[ 6 ] 2x 3
[3 ] = 3
12x = 3
x = 3 (:3) 1
----- = ------
12 (:3) 4
********************************
11.
∛ x
2 = 1
-----
16
x
----
3 - 4
2 = 2
x
---- = - 4
3
x = 3.(-4)
x = - 12
*************************************
12.
x² - 5x + 6
2 = 1
x² - 5x + 6 0
2 = 2
x² - 5x + 6 = 0
a = 1; b = - 5; c = 6
Δ = b² - 4ac
Δ = (-5)² - 4.1.6
Δ = 25 - 24
Δ = 1
x = - b +/- √Δ = - (-5) +/- √1
-------------- ----------------
2a 2.1
x = 5 + 1
-------- = 6/2 = 3
2
x = 5 - 1
------ = 4/2 = 2
2
R.: x = 3 e x = 2
Erlisson10:
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