145- Two numbers $a^{-2}$ and $6 + 14a$, the units digit of $a^2 + a$ equals which of the following? (4) $8$ (3) $7$ (2) $3$ (1) $2$
\textbf{145-} Two numbers $a^{-2}$ and $6 + 14a$, the units digit of $a^2 + a$ equals which of the following?
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(4) $8$ \hfill (3) $7$ \hfill (2) $3$ \hfill (1) $2$
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