anonymous
  • anonymous
expand and simplify where appropriate (x-8)^2
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
HELPPPP
anonymous
  • anonymous
(x-8)(x-8) = x ^2 -8x+ (-8x) (-)-8^2 = x^2 - 16x + 64
anonymous
  • anonymous
is that what you need to do O. o?

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anonymous
  • anonymous
yeah, i did it again and got that but i didnt know if it was right.. thanks heaps
anonymous
  • anonymous
:D you are welcome~
anonymous
  • anonymous
i have another question. Do you know how to do parabolas??
anonymous
  • anonymous
um, i will try :D
anonymous
  • anonymous
ok, because i keep doing something wrong and i was just wondering if you could do the equation so i could see where i went wrong.. if thats not asking too much??
anonymous
  • anonymous
yeah, sure, i will do my best XD
anonymous
  • anonymous
ok, thanks. heres the question..
anonymous
  • anonymous
ok
anonymous
  • anonymous
Over a period of 8hours, the temperature of a room follows the relationship T=h^2-6h+15 where T is the temperature in degrees Celcius, h hours after commencing the experiment a) Sketch the graph of this quadratic relationship b) What is the initial temperature? c) After 2 hours, is the temperature of the room increasing or decreasing? d) After 6 hours is the temperature of the room increasing or decreasing? e) Find the minimum temperature f) When did the minimum temperature occur? Sorry, it's alot :(
anonymous
  • anonymous
wait XD
anonymous
  • anonymous
a) y intercept : h=0 T=y y= 0^2 - 6(0) + 15 = 15 |dw:1378810220040:dw| i think the initial temperature will be the y intercept (0, 15) for the hours(x/ h)can not be negative c) T = (2)^2 - 6(2) + 15 (sub in or look at the graph) = 4 - 12 +15 = 7 (which mean decrease) d) same sub in or look at the graph T = (6)^2 - 6(6) + 15 = 36 - 36 + 15 = 15 (which mean it stay the same ( so it goes decrease at h = 7 and slowly go back up and h=6 will be back to the start temperature ) e) the minimum is the turning point which is T = x^2 - 6h + 15 = (x^2-6x+9) + 6 = (x - 3)^2 + 6 TP: (3, 6)
anonymous
  • anonymous
|dw:1378811359696:dw| Oh... drawing a graph here is so hard T ^ T
anonymous
  • anonymous
haha, OMG... YOU'RE A LIFESAVER..
anonymous
  • anonymous
> " < thanks~~ it make sense right? (i am not really good at explaining...)
anonymous
  • anonymous
yeah, im sure i will be able to understand it somehow... are you in school??
anonymous
  • anonymous
oh, and e and f is basally asking for the turning point e) 6 f) 3 yes, i am still learning XD have a test tomorrow
anonymous
  • anonymous
oh no, sorry.. i am probably confusing you.. do you live in Australia?
anonymous
  • anonymous
i am happy to help~~ :D so no worries, how can you know that i am from Aus O . O
anonymous
  • anonymous
no, im just guessing cause thats where im from.. :P what subject do you have a test on?
anonymous
  • anonymous
i have test on circular functions T ^ T
anonymous
  • anonymous
that sounds not one bit interesting to me. my maths exam is on friday the 13th, how unlucky
anonymous
  • anonymous
oh! good luck :P
anonymous
  • anonymous
thanks, you too :)
anonymous
  • anonymous
thanks :D i will go back to study now, study well!!
anonymous
  • anonymous
yeah, sorry about bothering you. Thanks, you too!!
anonymous
  • anonymous
no need to say sorry, i am glad that i help
anonymous
  • anonymous
helped* :P
anonymous
  • anonymous
thanks :)

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