Evaluation for 5.2d
Materials contain embedded supports for teachers to guide students toward increasingly efficient approaches.
The materials include embedded supports to guide educators in leading students toward increasingly efficient approaches across various lessons in Unit 8 of the
Grade 8 Advanced Mathematics course. For example, each lesson Overview page features a section titled Overview of Process Standards that explains how the lesson incorporates certain process standards. On the unit 8, lesson 1 Overview page, this section states, “In this lesson, students select tools, such as pencil and paper or technology, and techniques, including mental math, number sense, and fact fluency, to solve quadratic equations by factoring the quadratic polynomial when the equation is in standard form. Students may: Select technology as a tool to check their answers. Select pencil and paper, along with mental math, to factor a quadratic expression and then solve the equation. Select a technique like fact fluency to look for patterns in numbers, particularly factor pairs.” Another section in each lesson, Prior Learning Supports, describes how the lesson builds on similar content from previous lessons and grade levels. The example from unit 8, lesson 1 states, “Solving quadratic equations is a new skill to students in
Grade 8 Advanced Mathematics. However, some antecedent concepts and skills support students as they do. In Unit 7 of
Grade 8 Advanced Mathematics—
Algebra 1, students factored quadratic (degree two) expressions using a variety of techniques, including greatest common factors (inverse of the distributive property), perfect square trinomials, difference of squares binomials, and good old-fashioned ‘guess and check’ or ‘trial and error’ (8AM.10D). The student is expected to rewrite polynomial expressions of degree one and degree two in equivalent forms using the distributive property. (equivalent to A.10D) 8AM.10E The student is expected to factor, if possible, trinomials with real factors in the form ax2 + bx + c, including perfect square trinomials of degree two (equivalent to A.10E) (8AM.10F). The student is expected to decide if a binomial can be written as the difference of two squares and, if possible, use the structure of a difference of two squares to rewrite the binomial (equivalent to A.10F). In Unit 1 of
Grade 8 Advanced Mathematics—Algebra 1, students solved linear equations (degree one) with one variable, building on their middle school experiences of solving one-variable equations of degree one (8AM.5A). The student is expected to solve linear equations in one variable, including those for which the application of the distributive property is necessary and for which variables are included on both sides (equivalent to A.5A). A third section on each Lesson Overview page, Teaching Hints, gives educators hints and information to assist students, for example: “Connect back to students’ prior experiences with factoring. If necessary, rewrite the quadratic equation in standard form and then look for patterns such as: Perfect squares and Common factors. This lesson focuses on solving quadratic equations that can be factored into linear terms, and then applying the Zero Product Property to determine what value of x (or whichever variable is in the equation) makes each factor equal to 0. Subsequent lessons explore additional methods to solve quadratic equations. Use technology to check answers. Graph the original quadratic expression as though it were an equation and see where it crosses the line y = 0 (x-axis).”
The materials include embedded supports to guide educators in leading students toward increasingly efficient approaches in various Unit 8 lessons of the
Grade 8 Advanced Mathematics course. For example, each Lesson Overview page features a section titled Overview of Process Standards that explains how the lesson incorporates certain process standards. On the unit 8, lesson 5 Overview page, this section states, “In this lesson, students apply what they know about solving a quadratic equation to solve problems that present themselves in everyday life, society, and the workplace. Students may: Solve a quadratic equation using the quadratic formula in a geometric context such as area or volume. Solve a quadratic equation, using the quadratic formula, involving a scientific context such as projectile motion.” Another section in each lesson, Prior Learning Supports, describes how the lesson builds on similar content from previous lessons and grade levels. The example from unit 8, lesson 5 states, “Solving quadratic equations is a new skill to students in
Grade 8 Advanced Math—Algebra 1. However, some antecedent concepts and skills support students as they do so. Also, earlier in this unit, students solved quadratic equations using factoring and inverse operations (including completing the square when necessary). In Unit 1 of
Grade 8 Advanced Mathematics—Algebra 1, students solved linear equations (degree one) with one variable, building on their middle school experiences of solving one-variable equations of degree one. 8AM.5A The student is expected to solve linear equations in one variable, including those for which the application of the distributive property is necessary and for which variables are included on both sides (equivalent to A.5A). In Unit 7 of
Grade 8 Advanced Mathematics—Algebra 1, students factored quadratic (degree two) expressions using a variety of techniques, including greatest common factors (inverse of the distributive property), perfect square trinomials, difference of squares binomials, and good old-fashioned ‘guess and check’ or ‘trial and error.’ In this lesson, in order to take the square root of both sides of the equation as an inverse operation, the quadratic equation must be written in vertex form, a(x - h)2 + k, so that there is a binomial square that can be unsquared in order to get
x by itself without an exponent (8AM.10E). The student is expected to factor, if possible, trinomials with real factors in the form ax2 + bx + c, including perfect square trinomials of degree two. (equivalent to A.10E) Previously in Unit 8, students solved quadratic equations by factoring and inverse operations. In this lesson, students formalize the quadratic formula, which involves completing the square for a generic quadratic polynomial in standard form.” A third section on each lesson Overview page, Teaching Hints, gives educators hints and information to assist students, for example: “The quadratic formula works for equations in standard (polynomial) form that are equal to 0. You may need to review symbolic manipulation for students to rewrite equations in that form as needed. The quadratic formula will work for any quadratic equation. If the discriminant is positive, the equation has real solutions. If the discriminant is a perfect square, the equation has rational solutions. If the discriminant is negative, avoid telling students the quadratic equation has no solutions; that’s an incorrect statement. The equation has no real solutions and when students learn about complex numbers in Algebra 2, they will be able to solve this type of quadratic equation.”