Day 7: 10.6, Solve Quadratic Equations by the Quadratic Formula
Stephanie Bryan
Algebra I, 9th Grade
PA/ Local Standards:
Assessment Anchor M11.D.4.1: Interpret and/or use linear, quadratic and/or
exponential functions and their equations, graphs or tables.
Assessment Anchor M11.A.1.1.1: Find the square root of an integer to the nearest
tenth using either a calculator or estimation.
Standard 2.5.A1.A: Develop a plan to analyze a problem, identify the information
needed to solve the problem, carry out the plan, check whether the answer makes
sense, and explain how the problem was solved in grade appropriate contexts.
Essential Question(s):
How do you solve a quadratic equation?
Key Vocabulary:
Quadratic Formula: A formula that gives the solutions of any quadratic equation
in standard form
Understanding:
Students will understand that the quadratic formula can be used to solve any
quadratic equation in standard form.
Objective(s):
Students will identify a, b, and c in a quadratic equation and use the quadratic
formula to solve the equation.
Assessment:
Worksheet
Procedure:
1) Introduction – Review of completing the square, quadratic formula song,
continue note handout
2) Demonstrate how all methods can be used to find the same solutions to a
problem; “row game” worksheet in pairs
3) Instruction on using a graphing calculator to find solutions to a word
problem involving larger numbers
4) Independent Practice – Worksheet, 10.6 Practice B
5) Introduce final unit project
Differentiation:
Song to memorize quadratic formula, use of graphing calculators
Checking for Understanding:
Worksheet
Closure:
Demonstrating how all methods allow us to reach the same solutions to a
quadratic equation will provide closure to this section of the unit.
Solve by completing
the square.
Solve by using the
quadratic formula.
Solve by
completing the
square.
Solve by using the
quadratic formula.
Name:
Answer
Answer
Name:
Solve by using the
quadratic formula.
Solve by completing
the square.
Solve by using the
quadratic formula.
Solve by using
the quadratic
formula.
Solve by
completing the
square.
Solve by completing the square. Solve by using the quadratic formula. Solve by
completing the
square.
Solving Quadratic Equations