by 
Anonymous
ANSWERS: 3
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The domain runs along the x axis, and with the domain you're trying to find the lowest and highest point. According to your equation, the parabola begins at +1, so there's one of your answers since there is nothing lower than that on the graph. For the next part, you just say "all real numbers". This is because the parabola will continue to go upwards without end. (+1, R) would be your answer. P.S my teacher used to tell me to put a vertical strike through the middle of the "R" to indicate that it means "All real numbers"
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The domain is the x-axis, like Leopardgecko said. So we ask what values of x can be plugged into the equation that yield a y-value. Can we use x=0? Yes. f(0)= 1. Can we use x=-1? Yes. f(-1)= 4. Can we use x=-100? yes. The y-value is very high, but there is a real number value. Think of an x-value we can't use. There is no real number, positive or negative, when plugged in as an x-value, won't yield a real number (y-value). Therefore, since all x-values yield y-values, the domain is (-infinity, infinity).
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All real numbers
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