12 + 7 - 2
12 + 7 = 19
19 - 2 = 17
or
7 - 2 = 5
5 + 12 = 17
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To evaluate an algebraic expression means to simplify the expression as much as possible by replacing the variables in an expression with the numerical values given to you.Ex:Example of Evaluating an Algebraic ExpressionTo evaluate the algebraic expression '4.5 + x' for x = 3.2, we need to replace x with 3.2 and then add. 4.5 + x = 4.5 + 3.2=7.7Solved Example on Evaluating an Algebraic ExpressionEvaluate the algebraic expression p + 3q + 2p - 3q, for p = 2 and q = - 5.Choices:A. 12B. 18C. 3D. 6Correct Answer: DSolution:Step 1: p + 3q + 2p - 3q [Original expression.]Step 2: = (p + 2p) + (3q - 3q) [Group the like terms together.]Step 3: = 3p [Solve within the grouping symbols.]Step 4: = 3 x 2 [Substitute 2 for p.]Step 5: = 6 [Multiply.]
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do 43+57 which is 100 then do 100+68 which is 168 the answer is 168
There are two steps to the process: Step-1: Subtract 7 from 6. The answer to this step is -1. Remember that as you proceed to the next step. Now, go on to the next step. Step-2: Take the -1 from the first step, and add 5 to it. The new result is then +4 . The +4 that you have now is the value of the entire original expression.
Step by step and following the mathematical instructions as given by the expression.