I am sorry for not paying attention to the question. I am thus removing my post.

]]>Welcome to the forum.

I'm going to use x rather than o here to avoid confusion with zero.

root(1-x) cannot have a real value if x is positive as the square root of a negative doesn't exist in real numbers.

So I did a bit of trial and improvement. I set up Excel with 11 lines of formulas, testing from -1 to 0 in steps -0.9, -0.8 and so on. I could see a solution lay between -0.9 and -0.8 to I repeated the search between these and gradually 'homed in' on -0.866. That looked to me like root(3)/2 so I tried that directly and the expression evaluated to 1.

Now Excel only works with 'so many' digits of accuracy so this isn't a proof of the solution, but it gave me enough to switch to an algebraic method. What I'm about to show you has to be used with caution as it can lead to values that aren't solutions as well as values that are. Let me show you why:

Suppose we have a simple equation like x = 5. That's easy to 'solve' ; the answer is 5.

But if I square it: x^2 = 25 ; this has 2 solutions, x = 5 and x = -5. The second isn't a solution of my original equation! So if you ever use this technique, always check the values you end up with, to make sure they really do solve the original problem.

I'll replace the inequality with an equals.

square both sides

Simplify and rearrange

Square again:

The 'other' value can be disregarded as it is positive and I've already discounted that.

Bob

]]>remember that

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Please see the link : Peano axioms.

]]>Please see the link.

Flash (Flash Player) would be helpful!

]]>Please see the link:

Flash (Flash Player) would be helpful!

]]>bob bundy wrote:

(if necessary as the tree may not be vertical)

Ah, this reminds me to when I and my friends were lost in a mountain. Almost no tree was vertical there. However, I, not even realizing that I was lost due to trusting my experienced friends, thought that such thing was normal.

]]>Yes, that's correct!

Bob

]]>1. If I have two points, A and B, name at least four geometric elements u can create with only the two points. (For example, the name of a line through points X and Y would be written ln_XY.)

You do need 4 names such as ln_XY. (Hint: You are not looking for 4 different kinds of elements, just 4 different elements that are named.)

my answer, AB; In_AB; Is_AB; ry_AB

my teacher response -" You have all 3 types of elements, but only 4 of the names: ln_AB, ls_AB, ry_AB. (The points are already given.)"

So I'm guessing it has to be an angle or plane because thats the only other geometric element that I've learned.

]]>hence the point of inflection is (6,2/9) which is the answer found in your book. I hope that will help.]]>