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Evaluation is the process of finding the numerical value of an expression. For instance, suppose you wanted to know what x^3 was when x = 2. You would plug in 2 for x and get 2^3. This process is evaluation.Simplifying an expression on the other hand doesn't necessarily involve finding any particular value. For instance, suppose you started with the expression (x^3)/(x^2) then recognized that the numerator and denominator share a common factor of x^2 and so rewrote the expression as x. This is simplification because you've put the expression into an equivalent form that may be easier or more useful to deal with, but you have not found a specific value.You can also simplify numerical values -- for instance, 12/20 can be rewritten as 3/5. Often it's necessary to simplify a numerical expression after evaluating an algebraic one.
7a+a=8a
Like Terms and Variables
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To simplify a variable expression by evaluating its numerical part, first identify and calculate any numerical constants or coefficients present in the expression. Combine these numerical values through addition, subtraction, multiplication, or division as appropriate. After simplifying the numerical part, rewrite the expression by maintaining the variable components, resulting in a more concise and easier-to-understand form. For example, in the expression 3x + 5x, the numerical part (3 + 5) simplifies to 8, resulting in 8x.
A numerical expression is ' 2 + 3' A numerical equation is ' 2 + 3 = 5'.
To evaluate a variable expression, replace all the variables with numbers and simplify the resulting numerical expression. 3m for m = 9 3(9)=27
Simplify !
The answer to the question is given in the question!If you want to find the value of an algebraic expression, then you need to substitute numerical values for each of the variables in the expression, and then calculate and simplify the result.
The first step is to substitute the given values into the variable expression. This involves replacing each variable with its corresponding numerical value to simplify the expression. Once the values are substituted, you can then perform any necessary arithmetic operations to evaluate the expression.
The expression (-8u - 1.68) is not an equation, so it doesn't have a specific numerical answer without a value for (u). If you're looking to simplify or evaluate it, you would need to substitute a value for (u). Otherwise, it remains as is: (-8u - 1.68).
To evaluate a variable expression, first substitute the values of the variables with their corresponding numerical values. Next, perform the arithmetic operations in the correct order, following the rules of parentheses, exponents, multiplication and division, and addition and subtraction (PEMDAS/BODMAS). Finally, simplify the expression to obtain the final value.
After multiplying or dividing two rational expressions it is sometimes possible to simplify the resulting expression.
-2( 3m + 9 ) =