To combine the like terms in the expression \( 8a^3 + 2b^2 + b^2 \), we first identify the like terms.
The terms \( 2b^2 \) and \( b^2 \) are like terms because they both contain \( b^2 \).
Now, we can combine them:
\[ 2b^2 + b^2 = 3b^2 \]
So, the expression becomes:
\[ 8a^3 + 3b^2 \]
Thus, the simplified expression is:
\[ 8a^3 + 3b^2 \]
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