To multiply \( 5gh^2 + 4gh \) by \( 2gh \), we can distribute \( 2gh \) to each term in the expression.
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Multiply \( 2gh \) by \( 5gh^2 \): \[ 2gh \cdot 5gh^2 = 10g^2h^3 \]
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Multiply \( 2gh \) by \( 4gh \): \[ 2gh \cdot 4gh = 8g^2h^2 \]
Now, combine the results: \[ 10g^2h^3 + 8g^2h^2 \]
Thus, the complete expression after multiplying is: \[ 10g^2h^3 + 8g^2h^2 \]
Among the provided multiple-choice answers, the correct option is: \[ \textbf{10, g, squared, h, cubed, plus, 8, g, squared, h, squared} \quad 10g^2h^3 + 8g^2h^2 \]