Roots and Equations Worksheet with Quadratic and Cubic Equations 8.EE.A.2

Students solve square- and cube-root equations involving perfect powers, irrational roots and fractions, then classify selected roots and review worked solutions.
Grades
Grade 8
Pages
21
File type
PDF
Answer key
Included

Updated Nov 10, 2022

Subject
Math, Algebra
Topic
Square Roots, Cube Roots
Resource types
Worksheets
Answer key
Included
Standards
8.EE.A.2

Product description

From the author

A printable pdf worksheet for 8th grade math about roots and equations. Students will practice to:

Solve quadratic equations with perfect squares

Solve quadratic equations that have rational answers

Solve quadratic equations that have irrational answers

Remember that there are often two solutions to quadratic equations

Solve cubic equations with perfect cubes

Solve cubic equations that have rational answers

Solve cubic equations that have irrational answers

All answers are included.

In the classroom

Teaching tips & learning objectives

Learning objectives

  • Solve square equations, giving both real solutions when the right-hand side is positive.

  • Solve cube equations with positive, negative or fractional values.

  • Express square and cube roots in exact form.

Teaching tips

  • Assign the Perfect Squares/Cubes sections before the Square Roots/Cube Roots sections, since the worksheet's own sequence moves from whole-number perfect powers to irrational exact-form answers.

  • Use the Classify section as a quick formative check after the roots sections, since it tests the rational-versus-irrational distinction those sections build toward.

  • Check work against the answer section, which includes worked steps and exact answers.

Skills covered

  • Solving quadratic equations x squared = p -- students find both real solutions for positive right-hand sides (e.g., x = ±7) and recognize that x² = 0 has one real solution.

  • Solving cubic equations x cubed = p -- students find the single real solution, including for negative values of p, across the cube-equation sections.

  • Simplifying radicals -- students reduce square and cube roots of large numbers and fractions to exact simplified form.

Good to know

Questions teachers ask about this resource

Why do square equations sometimes have two real solutions?

For a positive value p, both the positive and negative square roots solve x² = p. Zero has one real square root, and negative values have no real square root.

What does the Classify section ask students to do?

Students sort square roots into rational and irrational categories.

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Curriculum

Standards, concepts & topics

Standards

  • 8.EE.A.2

Core concepts

  • Square roots

  • Cube roots

  • Rational vs. irrational numbers

  • Quadratic and cubic equations

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