
Lesson: The Quadratic Formula
Presentation
•
Mathematics
•
11th Grade
•
Practice Problem
•
Medium
Standards-aligned
Khaliah Jones
Used 7+ times
FREE Resource
13 Slides • 10 Questions
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Algebra - Lesson Solving Quadratics with Quadratic Formula

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This is the general form of a quadratic.
Remember, to solve this type of equation y must be equal to 0.
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Multiple Choice
Identify the a, b and c values for this equation:
3x2 - 8x + 15 = 0
a = 3, b = 8, c = 0
a = 3, b = -8, c = 15
a = 3, b = 8, c = 15
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Dropdown
Identify the values to use in the Quadratic Formula.
a =
b =
c =
7
Dropdown
Identify the values to use in the Quadratic Formula.
a =
b =
c =
8
Dropdown
Identify the values to use in the Quadratic Formula.
a =
b =
c =
9
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Multiple Choice
Which shows proper substitution into the Quadratic Formula to solve the equation:
x2−7x+6=0
x=2(1)−7±(−7)2−4(1)(6)
x=2(1)−(−7)±(−7)2−4(1)(6)
x=2(1)−(−7)±−72−4(1)(6)
x=2(1)−7±−72−4(1)(6)
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Multiple Choice
Use the Quadratic Formula to solve this equation. Simplify answers.
2x2+x−15=0
x=2(2)−(1)±(1)2−4(2)(−15) x=4−1±121
x=4−1±11
x=4−1−11
or
x=4−1+11
x=−412 or x=410
x=−3 or x=2.5
x=2(2)−(1)±(1)2−4(2)(15)
x=4−1±−119
No real solution since the square root of -119 is NOT a real number.
x=2(2)−(1)±(1)2−4(2)(−15) x=4−1±121
x=4−1±11
x=4−1−11
or
x=4−1+11
x=−412 or x=410
x=3 or x=−2.5
x=2(2)−(1)±(1)2−4(2)(−15) x=4−1±121
x=4−1±11
x=4−1−11
or
x=4−1+11
x=412 or x=410
x=3 or x=2.5
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Multiple Choice
Use the quadratic formula to find the solutions for
y = -x2 - 5x + 12
No Real Solution
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Multiple Choice
What would the equation be the a, b coefficients, and the constant c?
*remember, it should = ZERO before you identify a, b & c!
3p2−2p+19 = 24
a= 3, b= -2, c= 19
a= 19, b= 3, c= -2
a= 3, b= -2, c= -5
a= 3, b= -2, c= 43
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Multiple Choice
Which correctly shows the proper use of the quadratic formula for the equation? 3p2−2p−5
2(−2)−(3)±(−5)2−4(3)(−2)
2(3)−(2)±(−2)2−4(3)(−5)
2(−5)−(−2)±(3)2−4(3)(−2)
2(3)−(−2)±(−2)2−4(3)(−5)
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Multiple Choice
What are the solutions to the equation? −8r2−9r−1=−9
−169±337
−185±2 52
−185±176
−92±337
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Algebra - Lesson Solving Quadratics with Quadratic Formula

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