Evaluate The Expression Single Variable

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Evaluating an algebraic expression ways to summate the expression given a sure variable. Sometimes a problem will ask you to exercise this; most of the fourth dimension, withal, you will want to evaluate an expression to check your own algebra work. Equally long as you lot understand the basic terms and rules of algebra, evaluating an expression is a simple process.

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Place the parts of an algebraic expression. An algebraic expression is a set of numbers and letters combined by mathematical operations, such as addition, subtraction, division, and multiplication. The numbers in the expression are chosen constants or coefficients, depending on their function. The letters are called variables.^[ane]
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Understand what a variable is. A variable is a letter that represents any number. Therefore, variables are often used to represent unknown numbers. ^[two] In algebra, you are usually trying to observe the value of the variable. In order to evaluate an algebraic expression, however, you lot need to be given the variable's value.

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Determine how to evaluate the expression. Evaluate ways to simplify an expression. When you are asked to evaluate an algebraic expression, you need to plug a given value for the variable into the expression and solve.^[3]

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Identify the variable and its value. This information should be given to you. Unremarkably y'all will be told to evaluate the expression "when" or "where" the variable is equal to a certain value. If you are non given the variable's value, y'all cannot evaluate the expression.
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Substitute the given value for the variable. To do this, plug the given value into the expression wherever you come across the variable. If the variable has a coefficient (a number you demand to multiply its value by), make certain to put the value in parentheses.
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Consummate the necessary calculations. Remember to follow the social club of operations when solving an expression. When yous complete your calculations rewrite the expression every bit an equation.
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Evaluate an expression with Two Variables. To do this, follow the same steps as you exercise for evaluating an expression with 1 variable, except plug in the values for both variables into the equation. These values should exist given.

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Evaluate the following expression when $x=three$ : $2x+3$ .
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Evaluate the post-obit polynomial when $x=4$ : $7x^{2}-12x+xiii$ .

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Question

How practise I evaluate 10 and -7 ?

10 + (-7) = ten - 7 = 3.
Question

If x can have only values -3, 0, and two, and y can accept only the values -4, two, and three, what is the greatest possible value for 2x + y^ii?

Use 2, the highest positive value of x, and -4, the highest absolute value of y (because it'south squared), and evaluate the expression.
Question

How do I write the sum of a, b and c?

a + b + c.