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Evaluating

Evaluating. Algebraic. Expressions. Expressions. An expression is NOT an equation because it DOES NOT have an equal sign . There are 2 types of expressions. 5 + 84 Numerical 3 x + 10 Algebraic. Notice there are no equal signs in these expressions so they are not equations !.

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Evaluating

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  1. Evaluating Algebraic Expressions

  2. Expressions An expression is NOT an equation because it DOES NOT have an equal sign. There are 2 types of expressions. • 5 + 84 Numerical • 3x + 10 Algebraic Notice there are no equal signs in these expressions so they are not equations!

  3. Expressions A numerical expression contains only numbers and symbols and NO LETTERS. 5 times 3 plus 8 (5•3) + 8

  4. Expressions An algebraic expression contains only numbers, symbols, and variables. It is sometimes referred to as a variable expression. • The product of 3 and x 3x • The sum of m and 8 m + 8 • The difference of r and 2 r - 2

  5. Expressions What is a variable? A variable represents an unknown value. 2) 10 – ? 1) 4 + x 4) 20 3) 5y A variable can be any letter of the alphabet since it represents an unknown.

  6. Expressions Word Phrases for multiplication are: The product of 5 and a number c Seven times a number t 6 multiplied by a number d 5 • c or 5c 7 • t or 7t 6 • d or 6d

  7. Expressions The Placement rule for multiplication is: The product of 5 and a number c Seven times a number t 6 multiplied by a number d 5 • c or 5c Always write the variable AFTER the number. 7 • t or 7t 6 • d or 6d

  8. Expressions Evaluate means to find the value of an algebraic expression by substituting numbers in for variables. m = 2 6 + m ? 6 + 2 8

  9. Expressions Evaluate means to find the value of an algebraic expression by substituting numbers in for variables. r = 3 7 + r ? 7 + 3 10

  10. Expressions Evaluate the variable expression when n = 6. 1) 2) Evaluate just means solve by substitution.

  11. Expressions Evaluate the variable expression when n = 6. 4) 3) Evaluate just means solve by substitution.

  12. Expressions Evaluate the algebraic expression when n = 8. 1) 2)

  13. Expressions Evaluate the expression if a = 3 and b = 4. 1) 2)

  14. Expressions Evaluate the expression if a = 3 and b = 4. 3) 4)

  15. Expressions Evaluate the expression if x = 5 and y = 3. 2) 1)

  16. Expressions That's All Folks! Take Out Your Study Guide!!!

  17. TYPES OFEXPRESSIONS #1 An expression is NOT an equation because it does not have an equal sign. There are 2 types of expressions. NUMERICAL EXPRESSION: Contains only numbers and symbols. Example:5 • 3 + 4 ALGEBRAIC EXPRESSION: Contains numbers, symbols, and variables. Also known as a variable expression. Example:m + 8 A VARIABLE is a letter or symbol that represents a number. Example: x

  18. Substitute & Evaluate #2 Evaluate ifx = 3 and y = 4 Evaluate means solve. Show the substitution. Show your work down. Circle your answer. Show your work one step at a time down. No equal signs!

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