Understanding Quadratic Functions with Complex Zeros

This video tutorial demonstrates an alternative method for finding a quadratic equation with a given complex zero. The example provided involves a complex zero of 2 - 3i, and the video explains how complex zeros come in conjugate pairs, meaning 2 + 3i is also a zero. The method involves using the reverse order of completing the square to derive the quadratic equation. The tutorial concludes by comparing this method to others, highlighting its efficiency in reducing algebraic complexity.

What is the conjugate of the complex zero 2 - 3i?

• 2 + 3i

• 2 - 3i

• -2 + 3i

• -2 - 3i

Tags

CCSS.HSN.CN.C.9

Why do complex zeros come in pairs?

• Because they are conjugates of each other

• Because they are always positive

• Because they are imaginary

• Because they are always negative

Tags

CCSS.HSA-REI.B.4B

What is the first step in using the method of completing the square in reverse?

• Add 2 to both sides

• Subtract 2 from both sides

• Divide both sides by 2

• Multiply both sides by 2

Tags

CCSS.HSA-REI.B.4B

What operation is performed after subtracting 2 from both sides?

• Multiplying by i

• Taking the square root

• Dividing by i

• Squaring both sides

Tags

CCSS.HSN.CN.C.8

What is the result of squaring 3i?

• 9

• -9i

• -9

• 9i

What is the quadratic equation formed after simplifying?

• x^2 + 4x + 13 = 0

• x^2 - 4x - 13 = 0

• x^2 + 4x - 13 = 0

• x^2 - 4x + 13 = 0

Tags

CCSS.HSA-REI.B.4B

What is added to both sides to finalize the quadratic equation?

• 4

• -9

• -4

• 9

What is the final form of the quadratic function?

• f(x) = x^2 - 4x + 13

• f(x) = x^2 + 4x + 13

• f(x) = x^2 - 4x - 13

• f(x) = x^2 + 4x - 13

Tags

CCSS.8.EE.C.7B

How does this method compare to the traditional method?

• It requires more algebra

• It requires less algebra

• It is more complex

• It is less accurate

Tags

CCSS.8.EE.C.7B

What is the benefit of using this alternative method?

• It is faster

• It is more visual

• It is more intuitive

• It requires less algebra

Tags

CCSS.8.EE.C.7B