Let's identify each of the provided items as either an expression or an equation:
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2x^3 - 4x^2: This is an expression because it does not contain an equality sign.
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x - 3x^2 - 4: This is also an expression, as there is no equality sign present.
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5^x = 25: This is an equation because it contains an equality sign (the "=" sign).
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2x + 2π: This is an expression, as it does not include an equality sign.
In summary:
- 2x^3 - 4x^2: Expression
- x - 3x^2 - 4: Expression
- 5^x = 25: Equation
- 2x + 2π: Expression
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