## The Guide of finalizing Paste 2" X 2" Inch Photo Non-Immigrant Visa Application Online

If you are looking about Edit and create a Paste 2" X 2" Inch Photo Non-Immigrant Visa Application, here are the simple steps you need to follow:

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Get Form## How to Easily Edit Paste 2" X 2" Inch Photo Non-Immigrant Visa Application Online

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## PDF Editor FAQ

## How can you solve this equation for positive integers: [math]1+x+x^2+x^3+x^4=y^2[/math]?

When I first saw this problem, I remembered a similar yet simpler one that is usually given in early math Olympiads training stages:Find all positive integers [math]x[/math][math][/math] and [math]y[/math] that satisfy:[math]1+x+x^2=y^2\tag*{}[/math]The easy way to do it is to notice that:[math][/math][math] x^2<1+x+x^2 < (x+1)^2\tag*{}[/math]so [math]1+x+x^2[/math] is between two consecutive perfect squares, hence it cannot be a square too!Now this problem is more complicated, but I think a similar approach would work. Let’s figure out how we’re going to bound [math]1+x+x^2+x^3+x^4[/math] :It seems that [math](x^2+\frac{x}{2})^2[/math] is a good candidate. (I didn’t randomly pick this; I wanted an expression that,when squared, would yield [math]x^4+x^3+[/math] small powers of [math]x[/math][math][/math] )Well let’s see if this works by expanding:[math](x^2+\frac{x}{2})^2 =x^4 [/math][math][/math][math]+ x^3 [/math][math][/math][math] [/math][math][/math][math]+ \frac{x^2}{4} < 1+x+x^2+x^3+x^4\tag*{} [/math][math][/math][math][/math]Now, if we’re really lucky, then -fingers crossed- [math](x^2+\frac{x}{2}+1)^2[/math] would be an upper bound. Let’s check:[math](x^2+\frac{x}{2}+1)^2=x^4 [/math][math][/math][math]+ x^3 +\frac{9x^2}{4} [/math][math][/math][math]+ [/math][math]x[/math][math] [/math][math][/math][math]+ 1 > 1+x+x^2+x^3+x^4\tag*{} [/math][math][/math][math][/math]YES! so [math]1+x+x^2+x^3+x^4[/math] is between [math]2[/math][math][/math] consecutive perfect squares hence it cannot be a square. QEwait…Do you see the problem?[math](x^2+\frac{x}{2})^2[/math] is not necessarily a perfect square because [math]x^2+\frac{x}{2}[/math] is not necessarily an integer. So we need to consider these cases:1) If [math]x[/math][math][/math] is even:[math]x^2+\frac{x}{2} \in \mathbb{N}[/math] and we’d have no solutions.2) If [math]x[/math][math][/math] is odd:Then there is a unique integer between [math]x^2+\frac{x}{2}[/math] and [math]x^2+\frac{x}{2} +1[/math] and that integer is [math]x^2+\frac{x}{2}+\frac{1}{2}[/math]. This implies that, in order to have a solution, we must have:[math][/math][math] 1+x+x^2+x^3+x^4= (x^2+\frac{x}{2}+\frac{1}{2})^2 \tag*{}[/math][math]\Leftrightarrow 1+x+x^2+x^3+x^4=x^4 [/math][math][/math][math]+ x^3 [/math][math][/math][math]+ \frac{5x^2}{4} [/math][math][/math][math]+ \frac{x}{2} +\frac{1}{4} \tag*{}[/math][math]\Leftrightarrow \frac{x^2}{4} - \frac{x}{2}-\frac{3}{4}=0 \tag*{}[/math]The only positive integer solution of the quadratic is [math]x=3[/math] which gives [math]y=11[/math] and that’s the only solution to our problem. [math]\blacksquare[/math]

## What is a number whose cube is equal to the number itself but its square is not equal to the number itself?

Here’s a fun way to derive the answer (well, I think it’s fun, maybe you don’t).[math]x^3 = [/math][math]x[/math][math][/math]Subtract [math]x^2[/math] from both sides to get:[math]x^3 - x^2 = - x^2 [/math][math][/math][math]+ [/math][math]x[/math][math][/math][math]x[/math][math] [/math][math][/math][math]( x^2 - [/math][math]x[/math][math] [/math][math][/math][math]) = -1 [/math][math][/math][math]( x^2 - [/math][math]x[/math][math] [/math][math][/math][math])[/math]Now, we know that [math]x^2[/math] is not equal to [math]x[/math][math][/math], which means [math]x^2 - [/math][math]x[/math][math][/math] is not equal to zero. So, it’s safe to divide both sides by [math]x^2 - [/math][math]x[/math][math][/math] :[math]x[/math][math] = -1[/math]

## India: What all did Indians invent other than zero?

The beautiful game called "CHESS"There is an interesting story about the man, who invented chess coming from Persia and this story is around 800 years old.Long time ago a king named Shihram ruled over India. He was a despot. Around this time a wise man invented the game of chess to show the king how important everybody is, who lives in his kingdom, even the smallest among them.The king on the chess board needs his queen, his rooks, bishops, knights and the pawns to survive. This is like in real life. The king should learn this.Shihram, the king, understood this very well and he liked this game very much and he became a chess player and ordered that this game should be played by everybody in his kingdom.The king was very thankful, let the wise man come and went with him to his treasures to give him gold and silver or other valuable things."You are allowed to choose what you want!" he said to the man who invented chess. "I will give it to you!"The wise man thought for a while and said to the king. "I don't desire any of your treasures. I have a special wish!" And then he went with the king to a chess board."My wish is to get some wheat! Please put one grain of wheat on to the first chess square and two on to the second and keep doubling up the wheat until the last square!"The king became angry and shouted: "I have offered you all my treasures and you want just wheat? Do you want to offend me?""Oh no!" said the wise man. "I don't want to offend you, my king. Please respect my wish and you will see that my wish is truly great."The king called his servants and ordered to put the wheat on the chess board exactly as the wise man wished. The servants brought a lot of wheat. It soon filled many rooms but they realized that they could not fulfill the wise man's wish.They went to the king and said: "We are unable to fulfill the wise man's wish.""Why not?" asked the king angry.They answered: „All the wheat of your kingdom and all the wheat of other kingdoms is not enough to fulfill this wish."The king realized that the wise man had given him a lesson again. He learned that you should never underestimate the small things in life.The chess board has 64 squares and if you put just one grain on the first and double up on the next and so on, you will reach an enormous amount of grain.1 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2If you work this out you get an incredible amount of grain something like this: 18.446.744.073.709.551.615 around 18.446.744 Trillions of wheat grains. The man, who invented chess, whoever he was, has done a great job.Source: Who Invented Chess Game?

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