The expression \( 21 \cdot -3^x \) is an expression, not an equation. An equation would include an equals sign (e.g., \( 21 \cdot -3^x = 0 \)). In its current form, it simply represents a mathematical expression that can take different values depending on the value of \( x \).
Is 21 ⋅ −3^x an expression or equation
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