Quadratic formula

Quadratic Formula CW page 82

Multiple Choice

Determine the values of
a, b, and c for
the quadratic equation: 
4x² – 8x = 3

• a = 4, b = -8, c = 3
• a = 4, b =-8, c =-3
• a = 4, b = 8, c = 3
• a = 4, b = 8, c = -3

Multiple Choice

 $2x^2=8x+3$ 

 

 $2x^2-8x-3=0$  

 $x=\frac{8\pm\sqrt{64-4\left(2\right)\left(-3\right)}}{4}$  

 $x=\frac{8\pm\sqrt{40}}{4}$ 

 $x=\frac{8\pm2\sqrt{10}}{4}$  

 $x=\frac{4\pm\sqrt{10}}{2}$  

Suzanne solved the equation using this process.

Did she make a mistake?

If yes, at which line did she make her first mistake?

(There are 5 steps in her process)

• Suzanne made no errors.
  

• Step 2
  

• Step 3
  

• Step 4
  

• Step 5
  

Multiple Choice

 $3x^2-10x+1=0$  

Solve using the quadratic formula. Leave your answer in exact form.

•  $x=\frac{-10\pm\sqrt{88}}{6}$  

•  $x=\frac{-5\pm2\sqrt{22}}{3}$  

•  $x=\frac{10\pm\sqrt{112}}{6}$  

•  $x=\frac{5\pm\sqrt{22}}{3}$