The Eigenvalues of the Matrix $A = \left( \begin{array} { c c } 1 & - 2 \\1 & 4\end{array} \right)$

question 15

Multiple Choice

The eigenvalues of the matrix $A = \left( \begin{array} { c c } 1 & - 2 \\1 & 4\end{array} \right)$ are

• A) \(( 5 \pm \sqrt { 17 } ) / 2\)
• B) \(( - 5 \pm \sqrt { 17 } ) / 2\)
• C) 1, 2
• D) 2, 3
• E) 2, 2

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Definitions:

Absolute Threshold

The minimum intensity of a stimulus that one can detect at least 50% of the time.

Sensory Memory

A type of storage that holds sensory information for a very short period of time, usually under one second.

Stimulus Set Point

The threshold at which a stimulus is strong enough to elicit a response or reaction.

Just Noticeable Difference

The minimum difference in stimulation that a person can detect 50% of the time, a concept also known as the threshold of sensation.