an equation has an equals sign.
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Expression has no answer. a equation has an answer
dunctions are not set equal to a value
There are an infinite number of different quadratic equations. The quadratic formula is a single formula that can be used to find the pair of solutions to every quadratic equation.
radical equations have sq roots, cube roots etc. Quadratic equations have x2.
An expression has no equal sign whereas an equation does have an equal sign