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Mathematics 4 Online
OpenStudy (anonymous):

Solve: 3(x + 4)>= x - 2 x>= -7 x >= 7 x <= -7 x >=-3

OpenStudy (anonymous):

i have the answer i just wanna make shure its right

OpenStudy (goldphenoix):

What does 3(x+4) simplify to?

OpenStudy (anonymous):

3x+12

OpenStudy (goldphenoix):

So 3x+12 >= x -2 What do we do next?

OpenStudy (anonymous):

subtract 12 from both sides

OpenStudy (goldphenoix):

Sure. What do we get?

OpenStudy (anonymous):

3x>=x-14

OpenStudy (goldphenoix):

Next step?

OpenStudy (anonymous):

add x

OpenStudy (anonymous):

no subtract x

OpenStudy (goldphenoix):

Yes, subtract x.

OpenStudy (goldphenoix):

What do we get?

OpenStudy (anonymous):

2x>=-14

OpenStudy (goldphenoix):

Final step?

OpenStudy (anonymous):

x<=-7

OpenStudy (goldphenoix):

Nope.

OpenStudy (goldphenoix):

You only switch the inequality sign when you divide 2 negative number. :)

OpenStudy (anonymous):

x>=-7

OpenStudy (anonymous):

oh ok ill keep a note of that thanks

OpenStudy (goldphenoix):

Yes. You are correct! The answer is x>=-7. :)

OpenStudy (goldphenoix):

No problem. :)

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