sabrinannguyen sabrinannguyen

10-06-2016
Mathematics

contestada

How many solutions does the following equation have? |3x + 12| = 18

Respuesta :

michelle106 michelle106

10-06-2016

3x +12 = 18
-12 -12
---------------
3x 6
-- = --
3 3
x = 2

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10-06-2016

Hello,

if 3x+12>0 then |3x+12|=3x+12
so 3x+12=18==>3x=6==>x=2

if 3x+12<0 then |3x+12|=-(3x+12)=-3x-12
so -3x-12=18 ==>-3x=30==>x=-10

Two solutions!

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