The prefix quad means four. Fundamentally, a quadratic expression should have four terms. However, in some cases, two of the terms are like terms and are combined to form a single term. In that case the quadratic is reduced to three terms and called a trinomial. There is another case in which too of the terms are additive inverses - they are the same with the exception of the signs. Those two terms will have a canceling effect on each other and the expression will have only two terms. For that special case, the remaining terms are usually square terms. The expression is a difference of two squares. There are also other cases in which a quadratic expression might not be in its original form which is compromised of four terms.
quatric expression isn't 3 terms?
The prefix quad means four. Fundamentally, a quadratic expression should have four terms. However, in some cases, two of the terms are like terms and are combined to form a single term. In that case the quadratic is reduced to three terms and called a trinomial. There is another case in which too of the terms are additive inverses - they are the same with the exception of the signs. Those two terms will have a canceling effect on each other and the expression will have only two terms. For that special case, the remaining terms are usually square terms. The expression is a difference of two squares. There are also other cases in which a quadratic expression might not be in its original form which is compromised of four terms.
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