Solving Quadratic Equations

The video tutorial explains how to solve a quadratic equation using two methods: completing the square and factoring. Initially, the problem is presented, and viewers are encouraged to attempt solving it. The instructor then demonstrates the completing the square method, transforming the equation into a perfect square form and solving for x. An alternative approach using factoring is also shown, where the equation is set to zero and factored to find the solutions. Both methods yield the same solutions, providing a comprehensive understanding of solving quadratic equations.

What is the first step in completing the square for the equation x^2 - 8x + 1 = 85?

• Add 16 to both sides

• Add 8 to both sides

• Subtract 1 from both sides

• Multiply both sides by 2

Tags

CCSS.HSA-REI.B.4B

After completing the square, what is the resulting equation before solving for x?

• (x - 4)^2 = 101

• (x + 4)^2 = 101

• (x + 4)^2 = 100

• (x - 4)^2 = 100

Tags

CCSS.HSA-REI.B.4B

What is the purpose of adding and subtracting the same number when completing the square?

• To eliminate variables

• To change the equation

• To maintain equality

• To simplify the equation

Tags

CCSS.8.EE.A.2

What does the expression (x - 4)^2 = 100 imply about the values of x?

• x is equal to 4

• x can be any real number

• x is equal to 14 or -6

• x is equal to 10 or -10

Tags

CCSS.HSA-REI.B.4B

What is the alternative method to solve the quadratic equation after setting it to zero?

• Using the quadratic formula

• Completing the square again

• Graphing the equation

• Using synthetic division

Tags

CCSS.HSA-REI.B.4B

Why is it useful to set a quadratic equation to zero before solving?

• It makes the equation easier to graph

• It allows for factoring or using the quadratic formula

• It simplifies the equation

• It eliminates the constant term

Tags

CCSS.HSA-REI.B.4B

Which pair of numbers can be used to factor the equation x^2 - 8x - 84 = 0?

• 6 and 14

• 7 and 12

• 8 and 10

• 9 and 11

Tags

CCSS.HSA-REI.B.4B

What is the significance of the numbers 6 and -14 in the factoring method?

• They are coefficients of x

• They are solutions to the equation

• They are the roots of the equation

• They are factors of the constant term

Tags

CCSS.HSA-REI.B.4B

What is the final step in verifying the solutions obtained from factoring?

• Divide the solutions by 2

• Add the solutions together

• Multiply the solutions together

• Check if the solutions satisfy the original equation

Tags

CCSS.HSA-REI.B.4B

How can you verify the solutions obtained from different methods?

• By substituting them into a different equation

• By comparing them to the graph of the equation

• By using a calculator

• By checking if they satisfy the original equation

Tags

CCSS.HSA-REI.B.4B