Quadratic Formula Day 2

Multiple Select

Identify a,b, and c.

(Choose ALL correct answers)

• a=16

• b=40

• b=(-40)

• c=(-40)

• c=25

Multiple Choice

Choose the correct answer:

• $$x=\frac{-\left(16\right)\pm\sqrt[]{\left(-40\right)^2-4\left(16\right)\left(25\right)}}{2\left(-40\right)}$$  

• $$x=\frac{-\left(-40\right)\pm\sqrt[]{\left(16\right)^2-4\left(16\right)\left(25\right)}}{2\left(-40\right)}$$  

• $$x=\frac{-\left(-40\right)\pm\sqrt[]{\left(-40\right)^2-4\left(16\right)\left(25\right)}}{2\left(16\right)}$$  

Multiple Choice

What number is under the radical?

• -3200

• 0

• 4256

• -1640

Poll

Did you get the answer correct?

• YES!

• I got only one answer correct.

• No, but I see what I did wrong :(

• No, I have no clue what is going on.

Multiple Select

Identify a,b, and c.

(Choose ALL correct answers)

• a=3

• b=0

• b=(-72)

• c=(-72)

• c=0

Multiple Choice

Choose the correct answer:

• $$x=\frac{-\left(3\right)\pm\sqrt[]{\left(3\right)^2-4\left(0\right)\left(-72\right)}}{2\left(0\right)}$$  

• $$x=\frac{-\left(0\right)\pm\sqrt[]{\left(0\right)^2-4\left(3\right)\left(-72\right)}}{2\left(3\right)}$$  

• $$x=\frac{-\left(0\right)\pm\sqrt[]{\left(0\right)^2-4\left(3\right)\left(72\right)}}{2\left(3\right)}$$  

Multiple Choice

What number is under the radical?

• 0

• 864

• -864

• 216

Poll

Did you get the answer correct?

• YES!

• I got only one answer correct.

• No, but I see what I did wrong :(

• No, I have no clue what is going on.

Multiple Choice

Practice Problem #1

$$10x^2-9x=17$$  

• $$x=\left\{1.83,\ -0.93\right\}$$  

• $$x=\left\{1.55,\ -1.55\right\}$$  

• $$x=\left\{2.42,\ -1.42\right\}$$  

• $$x=\left\{0.93,\ -1.83\right\}$$