1 = 0

(x + 1)2  =  x2 + 2x + 1

(x + 1)2 – (2x + 1) = x2

(x + 1)2 – (2x + 1) – x(2x + 1) = x2 – x(2x + 1)

(x + 1)2 – (2x + 1)(x + 1) = x2 – x(2x + 1)

(x + 1)2 – (2x + 1)(x + 1) + (2x + 1)2/4 = x2 – x(2x + 1) + (2x + 1)2/4

[(x + 1) - (2x + 1)/2 ]2 = [x – (2x + 1)/2 ]2

(x + 1) - (2x + 1)/2  = x – (2x + 1)/2

x + 1 = x

1 = 0

Rubik's Cube

There is only 1 correct answer and 43 Quintilian wrong ones for Rubik's Cube.

In 1974, Hungarian professor Erno Rubik designed a small cube, with moving pieces, to help his students study three-dimensional geometry.

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Brain Teasers & Riddles To Blow Your Mind

Teaser #1:
Before Mount Everest was discovered, what was the tallest mountain in the world?
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Teaser #2:
When you need it you throw it away, when you don’t need it you take it in.
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Teaser #3:
Cathy has six pairs of black gloves and six pairs of brown gloves in her drawer. In complete darkness, how many gloves must she take from the drawer in order to be sure to get a pair that match? Think carefully!!
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Teaser #4:
If you can buy eight eggs for 26 cents, how many can you buy for a cent and a quarter?
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Teaser #5:
What kind of tables have no legs?
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Teaser #6:
What is the first thing you do every morning?
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Teaser #7:
A brick weighs a pound and half a brick. How many pounds do two bricks weigh?
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Teaser #8:
How long is a rope that is 2 yards shorter than another rope that is three times the length of the first rope?
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Teaser #9:
What is greater than god, more evil than the devil, the poor have it, the rich need it, and if you eat it you will eventually die?
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Teaser #10:
As long as I eat, I live. When I drink, I die
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Answer #1:
Mount Everest has always been the tallest mountain, even before being discovered!
Answer #2:
A ship’s anchor
Answer #3:
13. She could possibly take out 6 black left hand gloves and then 6 brown left hand gloves, the next one would have to be either the right hand or left hand match.
Answer #4:
Eight Eggs
Answer #5:
Timetable & Multiplication Table
Answer #6:
Wake Up
Answer #7:
2 bricks weigh 2 lbs and a whole brick, therefore 2 bricks weigh 4 lbs.
Answer #8:
If the length of the rope + 2 yards = 3 times the length of the rope, then the rope is 1 yard long.
Answer #9:
The word “Nothing”.
Answer #10:
Fire

Tangram