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Any real number may be substituted into a quadratic, so its domain is all numbers that are:
AReal
BPrime
CWhole
DEven
Answer & Solution
Correct answer: A. Real
1. Squaring and adding work on every real input.
2. Nothing is excluded the way division by zero would exclude a value.
3. So the domain is all real numbers.
_Source: OpenStax Precalculus 2e, Chapter 3, Polynomial and Rational Functions._
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