simplifying expressions objective simplify and evaluate algebraic expressions
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Simplifying Expressions
Objective
simplify and evaluate algebraic expressions
Evaluating Expressions
Remember to use correct order of operations.
Evaluate the expression 2x – 3xy +4y when
x = 3 and y = -5.
To find the numerical value of the expression, simply replace the variables in the expression with the appropriate number.
Example
Evaluate 2x–3xy +4y when x = 3 and y = -5.
Substitute in the numbers.
2(3) – 3(3)(-5) + 4(-5)
Use correct order of operations.
6 + 45 – 20
51 – 20
31
Evaluating Example
1and2when34Evaluate 22 yxyxyx
Evaluating Example
Substitute in the numbers.
1and2when34Evaluate 22 yxyxyx
Evaluating Example
Substitute in the numbers.
1and2when34Evaluate 22 yxyxyx
22 131242
Evaluating Example
Remember correct order of operations.
1and2when34Evaluate 22 yxyxyx
22 131242
Substitute in the numbers.
131244
384
15
Common Mistakes
Incorrect Correct
More Examples
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