Solve equation. Check for extraneous solution.
2|7-7x|=2x+4

Question

Solve equation. Check for extraneous solution.
2|7-7x|=2x+4

anonymous · Answer

i know that 2|7-7x|=2x+4 and 2|-7+7x|=2x+4 but then what do i do

anonymous · Answer

First step should always be to isolate the absolute value, not to negate it. So:
2|7-7x|=2x+4
|7-7x|=x+2
THEN you split the left side into the negative and positive situations:
-(7-7x)=x+2
AND
(7-7x)=x+2
Then solve and check for extraneous solutions.

anonymous · Answer

how do you know if it is an extraneous solution or not

anonymous · Answer

You solve for x and then plug it into the original equation to see if it's true or not.

anonymous · Answer

your wrong the multiple choice question was
a. x=3/2 or x=5/6         b. x=3/2 or x=5/8        c.x=5/8        d.x=3/2
the answers i got were x=2/3 or x=8/5

anonymous · Answer

someone else have better help??

primeralph · Answer

Yeah @Ell . Show your skills.
@karli111  She's good at this stuff.

primeralph · Answer

@Ell  We discussed similar problems earlier and recently.

primeralph · Answer

Well, I just wanted to have you both learn in tandem.

primeralph · Answer

@karli111  Here goes:

primeralph · Answer

Nobody's a pro by default. Takes practice courage.
Forget about it. Good luck.

primeralph · Answer

@karli111  Still there?

anonymous · Answer

yeah why

primeralph · Answer

Okay, I'll explain it. Pay attention:

primeralph · Answer

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