Thread: Maths.....

Is any one out there a maths teacher? or some one who is studying maths,

I have a terrible maths teacher who really dosent have the time of day for her students, if you don`t get it first time round you don`t get it.
I`ve lernt more from youtube and google than i have from her.

but i have a couple of questions i`m struggleing with, and was wondering if any one would be willing to help me with them?

first question is....the temperature in a room is kept constant at a maximum value (Tmax)whe the heating system is switched off for maintenance the temperature falls untill the work is completed and the system is switched on again.
The temperature then increases untill it once again reaches Tmax. the temperature at ant time (t hours) during the maintenance period is given by:

Tmax = t²-9t+61/4

a) what is the value of t max.

b Use the method of completing the square to determine:

i)the minimum temperature reached during the maintenance period.

ii)the amount of time the system was switched off for maintenance.