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1. simplify the expression and tell whether it represents a real number or a non-real number.

a. \\(\sqrt{144} - \sqrt{64}\\)

Explanation:

Evaluate the square roots

We evaluate each perfect square.

$$ \sqrt{144} = 12 $$

$$ \sqrt{64} = 8 $$

Subtract the values

We subtract the second value from the first.

$$ 12 - 8 = 4 $$

Classify the result

We determine the number type.
The number \(4\) is a real number.

Answer:

The simplified expression is \(4\), which represents a real number.