elainestorm5676
17.12.2020 •
Mathematics
The temperature y (in degrees Fahrenheit) after t months can be modeled by the function y=−2t2+12t +48, where 1≤t≤12. a. Write the function in vertex form. y= b. Find the maximum temperature during the year. The maximum temperature is degrees Fahrenheit.
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Ответ:
second number is x+1
x²+(x+1)²=85
x²+x²+2x+1=85
2x²+2x-84=0
x²+x-42=0
(x+7)(x-6)=0
x=-7, x=6
we need positive number, so we take 6
x=6
x+1=7