An expression does not equate to anything. An equation is equal to something.
Expression:
x+2
Equation:
x+4=2x
Equivalent expressions:
x+2 and 2x-2 if x=4
Equivalent equations:
x+4=2x and -x+10=2x if x=4
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As far as I know it's an expression because it doesn't have an equal sign. That's the main difference between expressions and equations.
There is no quadratic equation that is 'linear'. There are linear equations and quadratic equations. Linear equations are equations in which the degree of the variable is 1, and quadratic equations are those equations in which the degree of the variable is 2.
Numerical equations have only numbers and symbols, while algebraic equations have variables also.
Expressions cannot be solved. Only equations or inequalities may be solved. Also, there is no symbol between 3i and 5.
* word equations: describe the substances that react in a chemical reaction (termed reactants ), and the products that are formed, along with their states * formula equations are a shorthand method used to describe the same reactions.