Classify the expression: $5 x^{3}+2 x-3$
Quadratic expression
Linear expression
Cubic expression
Exponential expression

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Final Answer: $\boxed{\text{Cubic expression}}$

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Step 1 ：Classify the expression: $5 x^{3}+2 x-3$

Step 2 ：This is a polynomial expression. The degree of the polynomial is determined by the highest power of x. In this case, the highest power of x is 3, so this is a cubic expression.

Step 3 ：Final Answer: $\boxed{\text{Cubic expression}}$

Classify the expression: $5 x^{3}+2 x-3$Quadratic expressionLinear expressionCubic expressionExponential expression

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Classify the expression: $5 x^{3}+2 x-3$
Quadratic expression
Linear expression
Cubic expression
Exponential expression