Wednesday, June 17, 2015

Solve the equation: 5 l 3x-2 l = 10.

We'll solve the equation, expressing first the
modulus.


Case 1)


l 3x-2 l = 3x
- 2 for 3x-2 >= 0


3x =<
2


x =< 2/3


Now, we'll
solve the equation:


5(3x-2) =
10


3x-2 = 2


3x =
4


x = 4/3


Since x = 4/3 does
belong to the interval of admissible values,[2/3, +infinite], we'll accept
it.


Case 2)


l 3x-2 l = -3x + 2
for
3x-2 < 0


3x<2


x<2/3


Now,
we'll solve the equation:


5(-3x+2) =
10


-3x+2 = 2


 -3x =
0


x = 0


Since x = 0 does
belong to the interval of admissible values, (-infinite, 2/3), we'll accept
it.

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