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Solving Quadratic Equations by the Square Root Method – College Algebra Study Guide

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Q4. Solve by Square Root Method:

Background

Topic: Quadratic Equations – Square Root Method

This question tests your ability to solve a quadratic equation by isolating the squared term and then applying the square root property.

Key Terms and Formulas:

  • Quadratic Equation: An equation of the form .

  • Square Root Property: If , then .

Step-by-Step Guidance

  1. Subtract 4 from both sides to isolate the quadratic term: .

  2. Simplify the right side: .

  3. Divide both sides by 2 to solve for : .

  4. Now, apply the square root property to solve for .

Try solving on your own before revealing the answer!

Final Answer:

After isolating , you take the square root of both sides, remembering to include both the positive and negative roots.

Q5. Solve by Square Root Method:

Background

Topic: Quadratic Equations – Square Root Method

This question tests your ability to solve a quadratic equation where the variable is inside a binomial squared.

Key Terms and Formulas:

  • Square Root Property: If , then .

Step-by-Step Guidance

  1. Apply the square root property to both sides: .

  2. Simplify to get two possible values for .

  3. Solve for by subtracting 3 from both possible values.

Try solving on your own before revealing the answer!

Final Answer: and

Taking the square root gives or , so subtracting 3 yields the two solutions.

Q6. Solve by Square Root Method:

Background

Topic: Quadratic Equations – Square Root Method

This question tests your ability to solve a quadratic equation by isolating the squared term and then applying the square root property, including handling constants and coefficients.

Key Terms and Formulas:

  • Square Root Property: If , then .

  • Solving for when the variable is inside a binomial squared.

Step-by-Step Guidance

  1. Add 48 to both sides to isolate the squared term: .

  2. Apply the square root property: .

  3. Simplify (factor it if possible).

  4. Solve for by first adding 5 to both sides, then dividing by 4.

Try solving on your own before revealing the answer!

Final Answer:

, so , and solving for gives the answer above.

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