Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

#2 Re: Help Me ! » Simplify the following: » Today 05:00:28

2 is the the only real solution.

#4 Re: Help Me ! » Simplify the following: » Today 03:38:20

That factorization does not look correct.

#6 Re: Help Me ! » Simplify the following: » Today 00:32:59

Try to get all those terms to look like 2^x, that should work.

#10 Re: Help Me ! » Simplify the following: » Yesterday 23:56:05

10 is not an answer but 13 is.

Solve the first quadratic and you will see why.

#11 Re: Help Me ! » Simplify the following: » Yesterday 23:36:56

Yes, those are correct. You could have derived the exact answers though.

#13 Re: Help Me ! » In the game of Risk, what is the probability formula for this case? » Yesterday 20:23:43

Hi;

Sorry, I am close to a solution of my own and prefer not to look until it fizzles out.

#14 Re: Help Me ! » Simplify the following: » Yesterday 06:58:07

You are correct you can not factor that easily so you use the quadratic formula. try to get it on your own.

#15 Re: Help Me ! » Simplify the following: » Yesterday 06:41:52

You mean two roots from the quadratic equation? Yes, there will be two answers for y.

#16 Re: Help Me ! » Simplify the following: » Yesterday 06:35:00

The y's in post #352 are changed to 2^x and solved for.

#17 Re: Help Me ! » Simplify the following: » Yesterday 06:24:43

Those are correct for the plugging in.

#18 Re: Help Me ! » Simplify the following: » Yesterday 06:12:29

That is correct! You will get,

#19 Re: Help Me ! » Simplify the following: » Yesterday 06:00:56

You will get the polynomial when you use the substitution of y = 2^x of y^2 - 2y - 1 = 0.

#20 Re: Help Me ! » Simplify the following: » Yesterday 05:49:45

I think the same method to factor but use the quadratic formula to get the roots will get the answer.

I also think the book meant to solve this problem instead.

2^x + 2^-x = 2

#22 Re: Help Me ! » Simplify the following: » Yesterday 05:37:55

Please plug in x = 0 and tell me what you get?

#23 Re: Help Me ! » Simplify the following: » Yesterday 05:31:35

Have you copied the problem correctly?

2^x - 2^-x = 2 does not have zero for a root.

#24 Re: Help Me ! » Simplify the following: » Yesterday 05:15:33

That can not be factored, you are correct. We need another way.

#25 Re: Help Me ! » Simplify the following: » Yesterday 04:41:04

Multiply both sides by 2^x and do what you did before.

Board footer

Powered by FluxBB