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Additional Math Help HERE ONLY...!

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J.Darren:

--- Quote from: adrian1993 on June 09, 2010, 05:34:40 pm ---I got it as <=-6 and >9. I don't know why the mark scheme says its <=-6 but <=10

--- End quote ---
1-(x^2)+6x

-x^2 + 6x + 1

x = -0.16 or 6.16

dy/dx = -2x + 6

-2x + 6 = 0

x = 3

(-3)^2 + 6 (3) + 1

y = 28

maximum point (3, 28)

<= 28

adrian1993:
I don't really get what you wrote.

Anyways I managed to figure it out. The maximum point was (-3, 10)

So obviously the domain would be less than 10.

J.Darren:

--- Quote from: adrian1993 on June 09, 2010, 06:21:28 pm ---I don't really get what you wrote.

Anyways I managed to figure it out. The maximum point was (-3, 10)

So obviously the domain would be less than 10.

--- End quote ---
Uh I was trying to rewrite it in the quadratic form, as the parabola is going to be an inverted bowl shape, we can conclude that the range has to be smaller than the y coordinates of the maximum point ... Obviously I have made a computation error in working out the ... maximum point.

J.Darren:
12 hours to go ... argh !

adrian1993:
I am very excited and tense. XD

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