Englishfor English speakers
quadric
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noun
a curve or surface whose equation (in Cartesian coordinates) is of the second degree
expression
Noun
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An expression is a group of words, like a phrase or sentence, often one that is used by many people.
"Read between the lines" is a common expression for knowing meanings that are not written or spoken.
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An expression is a group of numbers and variables.
The expression "2x + y - 3" was set equal eight in the equation.