Mathematics
8 Online
OpenStudy (anonymous):
Solve for x: 4|2x - 2| + 10 = 34
x = -4, x = 2
x = 4, x = -4
x = 2, x = -2
x = 4, x = -2
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hartnn (hartnn):
start by subtracting 10 from both sides
hartnn (hartnn):
we are going to use this fact in this problem
\(|a|= b \implies a=b \quad or \quad a =-b\)
OpenStudy (anonymous):
-6 |2x-2| = 34
OpenStudy (anonymous):
is it A?
hartnn (hartnn):
not actually
\(4 |2x-2| +10-10 - 34-10 \\ 4|2x-2| = 24\)
did u get this ?
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OpenStudy (anonymous):
ohh i subtracted it wrong
hartnn (hartnn):
now divide both sides by 4 :)
OpenStudy (anonymous):
1|2x-2| = 6
hartnn (hartnn):
correct!
so, when |a| = b, we get a=b or a =-b
so here, for
|2x-2| = 6
we get
2x-2 = 6 or 2x-2 = -6
did u get this ?
can you solve these 2 equations ?
OpenStudy (anonymous):
so i solve 2x-2=6 and 2x-2=-6
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OpenStudy (anonymous):
??
hartnn (hartnn):
yes, can u solve thosE?
start by adding 2 on both sides
OpenStudy (anonymous):
so 4x-2=8 and 4x-2=-8
hartnn (hartnn):
the 2x would remain 2x only
because 2x and 2 are not like terms
hartnn (hartnn):
2x -2 =6
so
2x-2+2 = 6+2
2x = 8
got this ?
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OpenStudy (anonymous):
yes
hartnn (hartnn):
so what does x equal ?
OpenStudy (anonymous):
4
OpenStudy (anonymous):
so its B?
hartnn (hartnn):
nopes
for 2x-2 = -6
2x = -6+2 = -4
x= -2
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hartnn (hartnn):
so its D
OpenStudy (anonymous):
ohhh ok thanks
hartnn (hartnn):
welcome ^_^