Posted by **eric** on Monday, December 5, 2011 at 1:31pm.

A machine's ideal temperature is below 135 degreesF. The temperature T in degrees x minutes after it is turned on is T=-0.005x^2 = 0.45x + 125. Will the temperature ever exceed 135 degrees. Use the discriminate to decide. If the machine operates for 90 minutes before being turned off, how many times will the temperature be 134 degrees?

- algebra -
**Steve**, Monday, December 5, 2011 at 2:52pm
assuming that you mean

T=-0.005x^2 + 0.45x + 125

the max temperature is reached at x = -.45/-.01 = 45

so,

T(45) = 135.125

so, yes, the temperature does exceed 135, but only briefly (for 40<=x<=50)

Using the discriminant of

-0.005x^2 + 0.45x + 125 - 135 = 0

D = .45^2 - 4*.005*10 = .0025

D>0, so yes, T will exceed 135

Since the equation is a parabola, there will be at most two times. Those are at

x = 30 and 60

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