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Posts tagged with origins of odd numbers

ODD and EVEN NUMBERS. The Pythagoreans knew of the distinction between odd and even numbers. The Pythagoreans used the term gnomon for the odd number. A fragment of Philolaus (c. 425 B. C.) says that “numbers are of two special kinds, odd and even, with a third, even-odd, arising from a mixture of the two.” […]

by James posted under Uncategorized | tagged under History of Mathematics, numbers, odd and even, odd numers, origins of odd numbers | Comments Off

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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)?]