Question 261202
<ul><li>Rational and Irrational numbers are subsets of the Real Numbers.</li><li>The square of all Real numbers is either zero or positive. IOW, squares of Real numbers are never negative.</li><li>{{{sqrt(-4)}}} represents the number you square to get -4 as a result.</li><li>So {{{sqrt(-4)}}} is not a Real number. It is neither Rational or Irrational (which are types of Real numbers).</li><li>The set of numbers whose squares are negative is the set of Imaginary numbers.</li><li>So {{{sqrt(-4)}}} is an Imaginary number.</li></ul>