To determine the type of number resulting from multiplying \(-\sqrt{8}\) and \(45\), we first analyze \(-\sqrt{8}\).
\(\sqrt{8}\) can be simplified: \[ \sqrt{8} = \sqrt{4 \cdot 2} = \sqrt{4} \cdot \sqrt{2} = 2\sqrt{2} \] Therefore, \[ -\sqrt{8} = -2\sqrt{2} \]
Now, multiply this by \(45\): \[ -2\sqrt{2} \cdot 45 = -90\sqrt{2} \]
The number \(\sqrt{2}\) is an irrational number; thus, \(90\sqrt{2}\) is also an irrational number because a rational number (like 90) multiplied by an irrational number (like \(\sqrt{2}\)) remains irrational.
Therefore, the result of multiplying \(-\sqrt{8}\) and \(45\) is an irrational number.
The correct response is: an irrational number.