Exploring the Quadratic Formula and Discriminant

This video tutorial covers the concept of the discriminant in the quadratic formula. It explains how the discriminant, which is the part inside the square root, determines the number of solutions a quadratic equation has. The video discusses the implications of negative, zero, and positive discriminant values and provides graphical examples to illustrate these concepts. An example problem is solved to demonstrate the calculation of the discriminant and its role in determining the number of solutions.

What part of the quadratic formula is known as the discriminant?

• The coefficient of x

• The constant term

• The part inside the square root

• The entire formula

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CCSS.HSA-REI.B.4B

If the discriminant is negative, how many real solutions does the quadratic equation have?

• One

• Two

• Zero

• Infinite

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CCSS.HSA-REI.B.4B

What does it mean if the discriminant is zero?

• There are no real solutions

• There is exactly one real solution

• There are two real solutions

• The solutions are complex

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CCSS.HSA-REI.B.4B

If the discriminant is positive, how many solutions does the quadratic equation have?

• Infinite

• Zero

• Two

• One

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CCSS.HSA-REI.B.4B

What does a graph look like if the discriminant is zero?

• It never touches the x-axis

• It crosses the x-axis twice

• It is a straight line

• It touches the x-axis at exactly one point

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CCSS.HSF-IF.C.7A

What does a graph look like if the discriminant is negative?

• It never touches the x-axis

• It touches the x-axis at exactly one point

• It crosses the x-axis twice

• It is a straight line

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CCSS.HSF-IF.C.7A

In the example problem, what is the value of the discriminant?

• 48

• 192

• 144

• Negative 48

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CCSS.HSA-REI.B.4B

How many solutions does the quadratic equation have if the discriminant is negative 48?

• One

• Two

• Infinite

• Zero

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CCSS.HSA-REI.B.4B

What is the formula for the discriminant?

• d^2 - 4ac

• c^2 - 4ab

• a^2 - 4bc

• b^2 - 4ac

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CCSS.HSA-REI.B.4B

What should you remember about the minus sign when calculating the discriminant?

• It can turn into a plus if one of the terms is negative

• It can be ignored

• It only applies to positive terms

• It always stays a minus

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CCSS.HSA-REI.B.4B