Lesson Example Discussion Quiz: Class Homework |
Example |
Title: Quadratic-Equations and Factors |
Grade: 1400-a Lesson: S2-L1 |
Explanation: The best way to understand SAT-2 is by looking at some examples. Take turns and read each example for easy understanding. |
Examples:
Solve the quadratic equation: \$3"x"^2 - 14"x" + 8 = 0\$
Step 1a Case-1 |
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Given equation is \$3"x"^2 − 14"x" + 8 = 0\$ To solve this equation, we need to factorize the quadratic equation: case - 1 ⇒ \$3"x"^2 − 12"x" − 2"x" + 8 = 0\$ ⇒ 3x(x − 4) − 2(x − 4)=0 ⇒ (3x − 2)(x − 4) = 0 |
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Explanation: Here, the given quadratic equation is factorized into simple from is (3x - 2) (x - 4) = 0. |
Step 1b
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Setting each factor equal to zero 3x − 2 = 0 and x − 4 = 0. |
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Explanation: Equating each factor to zero, we distinctively isolate them. |
Step 1c
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Solving these equations gives us 3x = 2 and x = 4. \$"x" = 2/3\$ and x = 4 |
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Explanation: Here, the slove for x values are \$"x" = 2/3\$ and x = 4. |
Step 2a Case-2 |
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Given quadratic equation is \$3"x"^2 − 14"x" + 8 = 0\$ Identify the coefficients a, b, and c in the quadratic equation: Case - 2 \$"ax"^2 + "bx" + "c" = "0" \$ a = 3 , b = -14 , c = 8 |
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Explanation: Here, the values are given to the coefficients. |
Step 2b
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Use the quadratic formula: \$ "x" = (-b ± \sqrt (b^2 - 4ac))/(2a) \$ \$"x" = ((-(-14) ± \sqrt ((-14)^2 - 4(3)(8)))/((2)(3))) \$ \$"x" = (14 ± \sqrt (100)) / (6) \$ |
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Explanation: Here, substitute the values of a, b, and c into the quadratic formula. |
Step 2c
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Simplify the expression under the square root: \$ "x" = ((14 ± 10) / (6)) \$ x = 4 and x = \$ 2/3 \$ |
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Explanation: Here, slove for x values are \$"x" = 2/3\$ and x = 4. |
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