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Square Root Equations, Isolate x Squared First

Written by Adi Ackerman, Head Teacher

"Square Root Equations, Isolate x Squared First" is written for 8th Grade (Ages 13-14), and it covers Common Core 8.EE.A.2. A 7th grader who is already steady on square and cube roots can use it too, and an older student can use it as a short review.

Popular with 8th Grade teachers · Downloaded 324 times
Square Root Equations, Isolate x Squared First - Page 1
Square Root Equations, Isolate x Squared First - Page 2

2 pages in this set


8th grade math worksheet: isolate x² in 10 equations such as 3x² + 5 = 53, then write both square root solutions. Answer key included. Part of our root equations square and cube roots collection. Aligned to Common Core standards.

How do I use this worksheet?

Teach x² = p and x³ = p side by side so students see why one has two solutions and the other has one. Assign the isolate first sheets next, then use the maze and path puzzle for review.

What students will practice

  • Students will use inverse operations to get x² alone before taking a square root.
  • Students will solve two step equations such as 4x² + 11 = 335 and 2(x² + 7) = 214.
  • Students will write both the positive and negative solution for each of 10 equations.


Curriculum Links

Common Core State Standards

Expressions and Equations · 8th Grade

8.EE.A.2

Standard: Use square root and cube root symbols to represent solutions to equations of the form x² = p and x³ = p, where p is a positive rational number. Evaluate square roots of small perfect squares and cube roots of small perfect cubes. Know that √2 is irrational.

View all 8.EE.A.2 worksheets →

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FAQ

How do I use this root equations worksheet?

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Teach x² = p and x³ = p side by side so students see why one has two solutions and the other has one. Assign the isolate first sheets next, then use the maze and path puzzle for review.

What does this worksheet teach?

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Isolate x² in 10 equations such as 3x² + 5 = 53, then write both square root solutions. The directions on the page read: Get x² alone first, then solve. Show your work in the box and write both solutions. An answer key is included.

Can I use this root equations worksheet for homeschool or classroom?

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Yes, both. We made it for 8th grade square and cube roots, and it works the same at home or at school. At home, a student can work through it alone and then go over it with you, which shows quickly what is solid and what needs another look. In class it works as independent practice, homework or a warm-up, and you can print one copy or a full set.

Why does x² = p have two solutions?

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Every positive number has two square roots, one positive and one negative, and both give the same number when squared. So x² = 64 has the solutions 8 and negative 8, written x = ±8.

Why does x³ = p have only one solution?

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Every number has exactly one cube root, with the same sign as the number. So x³ = negative 8 has the single solution x = negative 2.

How do you solve an equation like 3x² + 5 = 53?

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Get x² alone first with inverse operations. Subtract 5 to get 3x² = 48, divide by 3 to get x² = 16, then take the square root to get x = ±4. Square Root Equations, Isolate x Squared First has 10 equations like this.

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Worksheet Details

Grade8th Grade
SubjectMath
TopicSquare and Cube Roots
Standard8.EE.A.2
Pages2 pages
DifficultyMedium

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