The common factor in the expression $4 a + 6 a^{2}$ is ___.

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Solution

The expression $4 a + 6 a^{2}$ can be written as

$2 \times 2 \times a + 2 \times 3 \times a \times a$

Taking out $2 a$ common from the expression, we get

$= 2 a (2 + 3 a)$

Therefore, the common factor in the given expression is $2 a$ .

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