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Talking about Math…let’s change the subject!


change subjectSo, you are at a friend’s party and they ask,

What did you do in the weekend?” You reply,

“Well, I did a bit of Math and…” Whaaat?” they say, startled.

You did What???


And what kind of Math did you do that made your weekend so exciting?

“Change the subject!” you say to your friend.

OK, let’s talk about something else!

Which is what this post is about – changing the subject. This area of Algebra is one of the most important to get right if you want to be a successful math student. Even at Junior High level, this is one key topic to work hard on understanding. Which is why H3 have gone to the trouble to attache a ppt to walk you through it. This is a resource that should prove really useful and is a free download of course! So, talking about Mathematics, let’s Change the Subject!
Changing the subject


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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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