Math 8 Module 15

Poll

How are you feeling today?

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Did you find the activity fun and engaging?

Open Ended

What steps did you use in deriving the quadratic formula?

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CHECKPOINT 1. Is everything clear so far?

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CHECKPOINT 2. Is everything clear so far?

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CHECKPOINT 3. Is everything clear so far?

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CHECKPOINT 4. Is everything clear so far?

Multiple Choice

Question 1: For the equation $$ax^2+bx+c=0\ \left(a\ne0\right)$$   , the quadratic formula gives the solutions as

• $$x=\frac{-b\pm\sqrt[]{b^2-4ac}}{2a}$$  

• $$x=\frac{b\pm\sqrt[]{b^2-4ac}}{4a}$$  

• $$x=\frac{-b\pm\sqrt[]{2b^2-2ac}}{2a}$$  

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Question 2: The radicand in the quadratic formula is $$b^2-4ac$$   and is called the _____.

• Imaginary Number

• Discriminant

• Real Number

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Question 3: To apply the quadratic formula to solve the equation $$8x^2-42x-27=0$$  , the value of a is ___, the value of b is ___, and the value of c is ___.

• $$8;\ -42;\ 27$$  

• $$8;\ 42;\ 27$$  

• $$8;\ -42;\ -27$$  

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Question 4: If the discriminant is positive, then the solutions to a quadratic equation will be _____ numbers.

• real

• imaginary

• complex

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Question 5: If the discriminant is negative, then the solutions to a quadratic equation will be _____ numbers.

• real

• imaginary

• complex

Poll

I can solve equations in quadratic form using the quadratic formula.

😍 - Confidently

😬 - With some help

😢 - No, I don't get it

Poll

I can use the discriminant to predict the number and type of solutions of a quadratic equation.

😍 - Confidently

😬 - With some help

😢 - No, I don't get it