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Posts tagged with irrational numbers

Why don’t tape measures show √2?

March3

Your boss asks you to cut a length of wood exactly to √2. So, you get out your tape measure and ….what? There is NO √2! There should be though? After all, √2 is an exact length!! It was worked out on a calculator so you should be able to measure it? Why don’t rulers […]

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Pi Day Revisited

December1

Yes, today is NOT Pi Day – well, not officially. After all, every day is Pi Day since every day Pi is being used to solve both simple and complex problems, many times without anyone realizing it. Yes, Pi might just have to be the most exciting irrational number on the planet! What do we mean […]

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Irrational Numbers are the never-stay-still numbers!

June24

Yes, irrational numbers are encountered in junior high school. These are like those friends of yours who never stay still in one place. Our mathematical definition is that irrational numbers have decimal expansions that keep on going. They are not rational numbers that can be shown as a simple fraction (one integer divided by another […]

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Relationships – the facebook of numbers

February22

Yes, it’s true – numbers behave much like people. For example, one group of numbers is even and another group odd (you may recognise the odd ones at a party); other numbers are very much alone – we call these the Prime Numbers (more on them in another blog). The Prime Numbers are the ones […]

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Post Support

NCEA Level 2 Algebra Problem. Using the information given, the shaded area = 9, that is:
y(y-8) = 9 –> y.y – 8y – 9 =0
–> (y-9)(y+1) = 0, therefore y = 9 (can’t have a distance of – 1 for the other solution for y)
Using the top and bottom of the rectangle,
x = (y-8)(y+2) = (9-8)(9+2) = 11
but, the left side = (x-4) = 11-4 = 7, but rhs = y+? = 9+?, which is greater than the value of the opp. side??
[I think that the left had side was a mistake and should have read (x+4)?]

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