G7 Chapter 5. Lesson 2.pptx
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This document discusses evaluating algebraic expressions. It defines an algebraic expression as containing variables, constants, and algebraic operations. Expressions are made up of terms. To evaluate an expression, you substitute values for the variables. Examples shown include finding the perimeter of a square for given side lengths and calculating the total cost of items Jundel buys. The key steps are to substitute values for variables in an expression and calculate the resulting value.
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- 2. Jens Martensson EVALUATION OF ALGEBRAIC EXPRESSION In this lesson, you will be able to … 2 ⮚Evaluate algebraic expressions for given values of the variables
- 3. Jens Martensson It is an expression which is made up of variables and constants, along with algebraic operations (addition, subtraction, etc.). Expressions are made up of terms. They are also termed as algebraic equations. Algebraic Expression Terms Coefficient Variable Constant Algebraic Equation
- 4. Jens Martensson Values of Algebraic Expression If the length of its side (in cm) is represented by an unknown x, then its perimeter (in cm) can be represented by the algebraic expression 4x. x cm Given: 8 cm 4x = 4(8)= 32cm Given: 20 cm 4x = 4(20)= 80cm SUBSTITUTION It is the method of replacing unknowns by number and the result obtained is the value of the algebraic expression.
- 5. Jens Martensson Formula The perimeter and the area of some plane figures can be represent by algebraic expressions. l w = 2 (l + w) cm w = 3 cm l = 5 cm 3cm 5cm = 2(3cm + 5cm) = 2(8cm) = 16cm = (3cm)(5cm)
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- 7. Thank You and Godbless! Francel Aira Derudar Math Teacher