Lesson Example Discussion Quiz: Class Homework |
Example |
Title: Evaluating Algebric Expressions |
Grade: 6-a Lesson: S2-L5 |
Explanation: The best way to understand algebra is by looking at some examples. Take turns and read each example for easy understanding. |
Examples:
Evaluate the expression when \$-5x^2 + 3x + 7\$ when x = -2
Step 1a
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Given expression \$-5x^2 + 3"x" + 7\$ Substitute the given x = -2 in the given equation \$- 5(- 2)^2 + 3(- 2) + 7\$ |
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Explanation: Here, substitute the variable value in the expression. |
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Step 1b
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Now, perform the calculation -5(4) - 6 + 7 -20 - 6 + 7 -26 + 7 -19 The value of the evaluated expression is - 19. |
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Explanation: Therefore, when x = −2, the value of the expression \$−5"x"^2 + 3"x" + 7\$ is − 19. |
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