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Mathematics 7 Online
OpenStudy (anonymous):

Can someone help with an absolute value question

OpenStudy (anonymous):

\[l4x+2l \ge10\]

OpenStudy (anonymous):

is this 14x?? or l4x??

OpenStudy (anonymous):

L4x*

OpenStudy (anonymous):

its 4x

OpenStudy (anonymous):

ohh ok

OpenStudy (anonymous):

I put the l for absolute value

OpenStudy (anonymous):

ok

OpenStudy (anonymous):

so i think its x=2

OpenStudy (anonymous):

but theres a less then or equal to sign therefore aren't there 2 answers?

OpenStudy (anonymous):

yes, but i dont have that symbol. it would be 2 and -2

OpenStudy (mathstudent55):

When you have an inequality of the form \(|X| \ge k\), where X is an expression in x and k is a number, change it to this compound inequality and solve the compound inequality: \( X \ge k\) or \(X \le -k\)

OpenStudy (mathstudent55):

Now let's look at your problem. \(|4x + 2| \ge 10\) We use the above rule to change it to: \(4x + 2 \ge 10\) or \(4x + 2 \le -10\)

OpenStudy (mathstudent55):

Now you need to solve each of those inequalities and write the word "or" in between the solutions.

OpenStudy (mathstudent55):

Do you need help with the two inequalities?

OpenStudy (anonymous):

no I got it thank you

OpenStudy (mathstudent55):

What did you get for your final answer?

OpenStudy (anonymous):

\[x \ge2 or x \le-3\]

OpenStudy (mathstudent55):

Excellent work! You deserve a medal.

OpenStudy (anonymous):

Thank You

OpenStudy (anonymous):

i had x =2 as well lol

OpenStudy (anonymous):

but i didnt do the minus

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