# How do you write an expression in standard form So, remember Evenm 2x2 and 2x3 are unlike, because they have different degrees. Again, the optional bits are really included in the previous items; for example, division is the same as multiplication by a reciprocal, and raising to the power of a negative integer is built out of the constant 1 and division.

Therefore, let's first eliminate the fractions. Again, these simplifications are considered part of the standard form.

### Standard form problems

Notice that the degree of a constatn expression is 0, while the degree of a non-constant linear expression is 1. In fact, given any equivalence of algebraic expressions, you can get another equivalence by substituting not necessarily a constant but any defined algebraic expression for one of the variables and you can do this multiple times to substitute for multiple variables. There are some degenerate cases. Solution Slope intercept form is the more popular of the two forms for writing equations. The largest degree of the terms is 3; we call this the degree of the polynomial as a whole. If the coefficient is 1 and there's at least one variable with a nonzero degree , then we can leave it out; for example, 1x3 is equivalent to simply x3. Division optional ; Raising to the powers of constant integers optional. Alternatively, if the coefficient is 1, then we can omit it; for example, 1x2y3 is equivalent to simply x2y3. Again, the optional bits are really included in the previous items; for example, division is the same as multiplication by a reciprocal, and raising to the power of a negative integer is built out of the constant 1 and division. A linear expression in standard form is essentially the sum of one or more terms: one constant term and one term for each variable in the expression. Now, a polynomial in standard form is the sum of one or more terms; each term must be a monomial in standard form. The next factor, x2, is the x-factor, whose degree is 2. If you find that you need more examples or more practice problems, check out the Algebra Class E-course.

Finally, the factors should come in alphabetical order by the variablewith the coefficient or constant factor first. Standard forms For linear expressions, monomials, and polynomials, there is a notion of standard form that an expression may be in.

### Polynomial in standard form

We now know that standard form equations should not contain fractions. Notice that the respective degrees of these terms are 3, 3, 3, 2, 1, and 0; among the degree-3 terms, the degrees on x are 3, 2, and 0. Combining like terms Probably the most important application of an identity in Algebra is combining like terms. Division optional ; Raising to the powers of constant integers optional. So for example, a is still not a rational expression. Finally, if the coefficient is 0, then the entire monomial is zero; for example, 0x2y3 is equivalent to simply 0. Finally, the terms should come in alphabetical order by the variable , with the constant term last. There is one other rule that we must abide by when writing equations in standard form. Writing Equations in Standard Form We know that equations can be written in slope intercept form or standard form. A linear expression in standard form is essentially the sum of one or more terms: one constant term and one term for each variable in the expression. Solution Now, let's look at an example that contains more than one fraction with different denominators.

Need More Help? We need to find the least common multiple LCM for the two fractions and then multiply all terms by that number!

## How do you write an expression in standard form

But there are still a few things that you can't do in a rational expression; most of these are operations that you won't study until Intermediate Algebra, but you still can't take absolute values. Also, the degrees of the terms should be decreasing as much as possible; for terms with the same total degree, the terms must have different degrees for at least one of the variables, and the first variable alphabetically whose degree changes must decrease. In fact, given any equivalence of algebraic expressions, you can get another equivalence by substituting not necessarily a constant but any defined algebraic expression for one of the variables and you can do this multiple times to substitute for multiple variables. Let's take a look at an example. Two algebraic expressions are equivalent if they always lead to the same result when you evaluate them, no matter what values you substitute for the variables. Finally, the degree of a constant expression is 0, since there is nothing to add; remember that the degree of the coefficient itself is always zero. But in fact, identities are good for more than that, and for Algebra we need to use them in more general ways. Most of the identities that I mentioned before are equivalences of algebraic expressions. If the coefficient is 1 and there's at least one variable with a nonzero degree , then we can leave it out; for example, 1x3 is equivalent to simply x3.

Equivalent expressions We often want to replace a complicated expression with a simpler one that means the same thing.

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