Quadratic Formula

Quadratic Formula

• I can solve quadratic equations by completing the square.

• I can solve quadratic equations by using the quadratic formula.​

​https://youtu.be/PJQpNPIDsV0

Multiple Select

I can solve quadratic equations by completing the square.

$$x^2-2x-80=0$$  

• $$x=-8$$  

• $$x=10$$  

• $$x=8$$  

• $$x=2$$  

Multiple Choice

I can solve quadratic equations by completing the square.

$$x^2-18x+67=0$$  

• $$x=\pm\sqrt{23}$$  

• $$x=23$$  

• $$x=9\pm\sqrt{14}$$  

• $$x=3\pm\sqrt{14}$$  

Multiple Choice

I can solve quadratic equations by using the quadratic formula.​

What is the quadratic formula?

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

• $$x=\sqrt{b^2-4ab}$$  

• $$-b\pm\frac{\sqrt{b^2-4ac}}{2a}$$  

Multiple Select

I can solve quadratic equations by using the quadratic formula.​

$$10x^2-23x+6=0$$  

• $$x=2$$  

• $$x=-\frac{3}{2}$$  

• $$x=\frac{3}{10}$$  

• $$x=\frac{3}{2}$$  

Multiple Choice

I can solve quadratic equations by using the quadratic formula.​

$$x^2-12x+12=0$$  

• $$x=\pm\sqrt{6}$$  

• $$x=6\pm2\sqrt{6}$$

• $$x=12\pm4\sqrt{6}$$  

Multiple Choice

I can solve quadratic equations by using the quadratic formula.​

$$3x^2+x-7=0$$  

• $$x=1\pm\sqrt{28}$$  

• $$x=\frac{1\pm\sqrt{-83}}{6}$$  

• $$x=\frac{-1\pm\sqrt{85}}{6}$$