Charlie uses the function f(x) = 2x2 + 5x + 3 to track the temperature of a substance, where x represents the time. When you eva
luate f(5) you find that the temperature of the substance is 78°C. What is the domain of the situation of Charlie's quadratic function? A)
all real numbers
THE ANSWER IS D. The domain of the Charlie's function is all<span> real numbers greater than zero</span>. The function alone would have a domain of all real numbers. In the situation given, time cannot be negative, and therefore, cannot be a part of the domain.
