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Posts tagged with Rene Descartes

Coordinates the modern way!

November23

So, you are sitting in a math class, wondering why you are doing Coordinate Geometry? You know the feeling – using (x,y) to show the place of a point on a Cartesian Plane. The Cartesian Plane was named after the French mathematician, Rene Descartes (right). He was a really bright Math guy as well as […]

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All numbers are in our imagination…

August31

…even Imaginary Numbers! Yes, we were all taught in school that you cannot take the square root of a negative number. Quite right! Well, not quite right!! Actually, around a few hundred years ago (early 1600’s), someone (Ren√© Descartes actually)¬†thought it might be really useful to be able to find the square root of a […]

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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)?]

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