Friday, November 18, 2005

Substituting in the Quadradic

today we watched a movie were it showed us something about substituting, and parabola.
for example.

eg. x2 + 3x - 5x + 2x2 - 9

step 1) You Change the value of x.. say it was 2 to make it easier.
- rewrite the question, then change the x's into 2 like this..

x2 + 3x - 5x + 2x2 - 9

2(2) + 3x - 5x + 2x2 - 9

and so on..

2(2) + 3(2) - 5x + 2x2 - 9

2(2) + 3(2) - 5(2) + 2x2 - 9

2(2) + 3(2) - 5(2) + 2(2)2 - 9

step 2) when you've finished changing all the x's into 2's the rest is easy.
Remember B.E.D.M.A.S -- brackets, exponents, division, multiplication, addition, and subtraction.

2(2) + 3(2) - 5(2) + 2(2)2 - 9

4 + 3(2) - 5(2) + 2(2)2 - 9

4 + 6 - 10 + 8 - 9

this one equals to -1.

10 - 10 = 0
8 - 9 = -1

Well, That's all there is to it.

if you didn't get what i just said, just ask the teacher lol. (laugh out loud)

PEACE OUT.

1 Comments:

At 6:09 PM, Blogger Danny T said...

mmmm its alot more understanding if you bold the numbers in the B.E.D.M.A.S when your publishing it on the blog. Its more easier to see what your doing ( laugh out loud ). But GOOD JOB!

 

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