To factor the expression \( 8mn^3 + 152m^2n^3 \), we first need to identify the greatest common factor (GCF) of the two terms.
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Identify the coefficients: The coefficients are 8 and 152. The GCF of 8 and 152 is 8.
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Identify the variable components:
- The first term has \( mn^3 \) and the second term has \( m^2n^3 \).
- The common factors in terms of variables are \( m \) (since the first term has \( m^1 \) and the second term has \( m^2 \)) and \( n^3 \) (both terms have \( n^3 \)).
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Combine the GCF: The GCF of the entire expression is \( 8mn^3 \).
Now we can factor this out:
\[ 8mn^3 + 152m^2n^3 = 8mn^3(1 + 19m) \]
Thus, the expression in factored form is:
\[ \boxed{8mn^3(1 + 19m)} \]