Algebra 75 - Completing the Square - part 1

The video tutorial introduces the concept of solving quadratic equations by completing the square, a method developed by al-Khwarizmi. It explains how to transform a quadratic equation into a perfect square form, allowing for easier solutions. The tutorial compares different quadratic functions, demonstrates the calculation of the constant term needed for a perfect square, and provides example problems to illustrate the method. The video concludes with a summary and a preview of the next topic.

Who developed the technique of completing the square?

• Isaac Newton

• Euclid

• al-Khwarizmi

• Pythagoras

What is the main goal of completing the square?

• To find the vertex of the parabola

• To eliminate the x term

• To transform a quadratic into a perfect square

• To factor the quadratic expression

What is a characteristic of a perfect square quadratic function?

• It has a single x-intercept

• It has two distinct x-intercepts

• It has no x-intercepts

• It has three x-intercepts

How can you determine the constant term to make a quadratic a perfect square?

• By multiplying the coefficients

• By adding the coefficients

• By using the formula b/2 squared

• By setting it equal to zero

What is the first step in solving a quadratic equation by completing the square?

• Divide both sides by the x squared coefficient

• Multiply both sides by the x coefficient

• Add the constant term to both sides

• Subtract the x term from both sides

In the example x^2 + 2x - 2 = 0, what is b/2 squared?

• 0

• 2

• 1

• 4

What is the solution set for the equation x^2 + 2x - 2 = 0?

• x = 2 ± √3

• x = 1 ± √3

• x = 0 ± √3

• x = -1 ± √3

What is the result of completing the square for x^2 + 9x + 12?

• x + 6

• x + 3/2

• x + 9/2

• x + 4

What is the simplified form of 33/4 under the square root?

• √33/4

• √33

• √33/8

• √33/2

What is the final solution for x in the equation x^2 + 9x + 12 = 0?

• x = -9 ± √33/4

• x = 9 ± √33/4

• x = 9 ± √33/2

• x = -9 ± √33/2