To find the product of the polynomials \((2x + 1)(x - 4)\), we can use the distributive property (also known as the FOIL method for binomials).
Let's calculate it step by step:
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First: Multiply the first terms. \[ 2x \cdot x = 2x^2 \]
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Outer: Multiply the outer terms. \[ 2x \cdot (-4) = -8x \]
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Inner: Multiply the inner terms. \[ 1 \cdot x = x \]
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Last: Multiply the last terms. \[ 1 \cdot (-4) = -4 \]
Now, combine all these results: \[ 2x^2 - 8x + x - 4 \]
Combine like terms \((-8x + x)\): \[ 2x^2 - 7x - 4 \]
Thus, the product of the polynomials \((2x + 1)(x - 4)\) is: \[ \boxed{2x^2 - 7x - 4} \]