MA, Stanford University
Teaching in the San Francisco Bay Area
Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts
One way to learn about domain restrictions is to look at specific functions that have domain restrictions. If you have a fraction with an x in the denominator, then you will have a domain restriction on x because dividing by zero is undefined. Any value of x that would make the denominator of the fraction zero is restricted from the domain. In a radical, we can not have the square root of a negative number, so any values of x that would make the radicand negative are excluded. In an exponential function, our output, or range could never be negative, so the range is limited to positive values only.
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