Qualification > Math

Math

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Tutu_93:
its infront of me ..
but we have this teacher who doesnt knw how to explaain so im really fed up :'(

Ghost Of Highbury:

--- Quote from: Tutu_93 on October 17, 2009, 01:31:06 pm ---its infront of me ..
but we have this teacher who doesnt knw how to explaain so im really fed up :'(


--- End quote ---

completeing the square is a very easy method...chk google.com to find a resource on that..

and the later part...is just differentiating it..and equating it to 0 to find the stationary point ....

astarmathsandphysics:
Completing the square is writing a quadratic in the form (x+a)^2 +b. In the example you gave both a and b equal 2. I will post a link when i get home

Tutu_93:
Okaay :D ..
Thnnx By the way

slvri:

--- Quote from: Tutu_93 on October 17, 2009, 01:18:15 pm ---I have a question in math sl
emm USe the method of completing the square to find the minimum value of y and and x at which it occurs

eg : y=x2 + 4x + 6

Waat do they mean ??

And i have texas Ti-84 silver edition .. how can i use it to graph and that stuff ??

--- End quote ---
ok.........y=x2+4x+6
y=(x2+4x)+6
y=((x)2+2(x)(2)+(2)2)+6-(2)2
y=(x+2)2+6-4
y=(x+2)2+2
Now the minimum value will occur when (x+2)2=0(remember this as a rule)
(x+2)2=0
x+2=0
x=-2
and the corresponding minimum value of y is
y=(-2+2)2+2
y=2
hope this helped :)

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