Question
Write the greatest common factor in each of the following terms.
$-18a^2, 108a$
$-18a^2, 108a$
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| $x$ | $5$ | $7$ | $9$ | $15$ | $18$ | $25$ |
| $y$ | $15$ | $21$ | $27$ | $60$ | $72$ | $75$ |