Absolute Value (algebraic version)....2

[nycmathguy]

Homework Statement

Rewrite each expression without using absolute value notation.

Relevant Equations

n/a

Absolute Value (algebraic version)
Rule:

| x | = x when x ≥ 0

| x | = -x when x > 0

Rewrite each expression without using absolute value notation.

Question 1

| x^4 + 1 |

I say x^4 + 1 is a positive value.

My answer is x^4 + 1.

Question 2

|-sqrt{3} - sqrt{5} |

The value of -sqrt{3} - sqrt{5} is negative.

So, -(-sqrt{3} - sqrt{5}) becomes
sqrt{3} + sqrt{5}.

You say?

 

[Ssnow]

I agree.
Ssnow

 

[nycmathguy]

I agree.
Ssnow

Really? I got it right? This can't be true. I'm not ready for precalculus or so they say.

 

[Mark44]

I'm not ready for precalculus or so they say.

You're still in chapter 1, right? If you were really doing as well as you think you are, you wouldn't need to have forum members check each and every problem you post.

As I recall, you had a fair amount of difficulty coming up with a solution to the diagonals of a parallelogram, and some more difficulty at find the equation of a linear function when you were given two points on it.

 

[nycmathguy]

You're still in chapter 1, right? If you were really doing as well as you think you are, you wouldn't need to have forum members check each and every problem you post.

As I recall, you had a fair amount of difficulty coming up with a solution to the diagonals of a parallelogram, and some more difficulty at find the equation of a linear function when you were given two points on it.

Each chapter in the textbook is divided into several sections. I am going section by section, problem by problem, if that's even possible, and having fun along the way. Are you saying I should be in chapter 5 or 6 or 7? I will eventually get there.

I don't feel a need for speed. No exam the next day. No teacher to answer to. No student pressure. I joined this site not seeking compassion but patience and understanding.

I know that this is a volunteer site, like most others, but I was hoping to land a spot here without all the negativity and senseless comments that lead to arguments. This is a physics and math site not a site to fight about useless information.

 

[Mark44]

but I was hoping to land a spot here without all the negativity and senseless comments that lead to arguments. This is a physics and math site not a site to fight about useless information.

The negativity comes from your interpretation that our comments are useless, and your refusal to deem them helpful. If someone comes here to ask for help, and we provide help and guidance, but you ignore any and all suggestions, what are we to think? You and I went round and round about adding helpful Homework Statements and Relevant Equations, which I assume that you still consider to be some of the "senseless" comments. As I explained before, having a clear idea of what you're trying to do, and what you need to do it with, goes a long way toward being able to solve the problem.

No one is saying you should be in chapter 5 or whatever -- if that's the implication you drew, you're way off. What we would like to see, though, is some realization that you shouldn't need to post, say, three questions about determining a particular linear equation. A better strategy is to think about what is similar in those questions, and what you learn from one problem can be applied to others of almost exactly the same type.

 

[nycmathguy]

The negativity comes from your interpretation that our comments are useless, and your refusal to deem them helpful. If someone comes here to ask for help, and we provide help and guidance, but you ignore any and all suggestions, what are we to think? You and I went round and round about adding helpful Homework Statements and Relevant Equations, which I assume that you still consider to be some of the "senseless" comments. As I explained before, having a clear idea of what you're trying to do, and what you need to do it with, goes a long way toward being able to solve the problem.

No one is saying you should be in chapter 5 or whatever -- if that's the implication you drew, you're way off. What we would like to see, though, is some realization that you shouldn't need to post, say, three questions about determining a particular linear equation. A better strategy is to think about what is similar in those questions, and what you learn from one problem can be applied to others of almost exactly the same type.

You said:

"What we would like to see, though, is some realization that you shouldn't need to post, say, three questions about determining a particular linear equation. A better strategy is to think about what is similar in those questions, and what you learn from one problem can be applied to others of almost exactly the same type."

Can you give me an example?

 

[Mark44]

Can you give me an example?

Sure. Here are three of your threads on finding a linear equation:

• Write A Linear Equation - https://www.physicsforums.com/threads/write-a-linear-equation.1004297/
• Form A Linear Equation - https://www.physicsforums.com/threads/form-a-linear-equation.1004299/
• Write A Linear Model - https://www.physicsforums.com/threads/write-a-linear-model.1004301/

Here are four threads on absolute values:

• Absolute Value (algebraic version)...1 - https://www.physicsforums.com/threads/absolute-value-algebraic-version-1.1004395/
• Absolute Value (algebraic version)...2 - https://www.physicsforums.com/threads/absolute-value-algebraic-version-2.1004396/
• Simplify An Expression Containing Absolute Values - https://www.physicsforums.com/threa...taining-absolute-values.1004397/#post-6506938
• Rewrite An Expression To Eliminate Absolute Value - https://www.physicsforums.com/threa...liminate-absolute-value.1004398/#post-6506940

There were at least two threads on finding the equation of a circle. If you know the center and the radius, it's trivial to get the equation. If you know two points on the diameter, you can find the radius and the center, and then write the circle's equation.

What I and others are saying is that it would be beneficial for you to think about the similarities of these problems, and, once you've found the solution to one, use the ideas to be able to convince yourself, without the crutch of this site, that you can work through similar problems.