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2019-02-25 2:13 pm
The completion of a chemical reaction Is expressed by the equation y=300-4x-x^2, where y is the number of seconds needed to complete the reaction and x is the temperature in degrees Celsius at which the reaction occurs. If the reaction is complete in 160 seconds, what is the temperature at which the reaction occurs?
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2019-02-25 4:47 pm
✔ 最佳答案
y = 300 - 4x - x²When y = 160:
160 = 300 - 4x - x²
x² + 4x - 140 = 0
(x - 10)(x + 14) = 0
x = 10 or x = -14
Temperature = 10°C or -14°C
2019-02-25 3:54 pm
Using your data, your equation becomes 160 =300 - 4x - x^2. if we use the quadratic formula x equals 10 degrees celsius, or 283 degrees Kelvin.
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