Evaluate

\[ (a – 0.1)(a + 0.1) \]

Solution:

Using identity:

\[ (a-b)(a+b)=a^2-b^2 \]

\[ (a – 0.1)(a + 0.1) \]

\[ = a^2 – (0.1)^2 \]

\[ = a^2 – 0.01 \]

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