4.5 Solving Quadratic Equations

Which of the following is the correct set up for the quadratic formula?

 $2x²-4x=-18$  

•  $\frac{-\left(-4\right)\pm\sqrt{\left(-4\right)^2-4\left(2\right)\left(18\right)}}{2\left(2\right)}$  
  

•  $\frac{-\left(4\right)\pm\sqrt{\left(4\right)^2-4\left(2\right)\left(18\right)}}{2\left(2\right)}$  
  

•  $\frac{-\left(-4\right)\pm\sqrt{\left(-4\right)^2-4\left(2\right)\left(-18\right)}}{2\left(2\right)}$  
  

•  $\frac{-\left(4\right)\pm\sqrt{\left(-4\right)^2-4\left(2\right)\left(-18\right)}}{2\left(2\right)}$  
  

Tags

CCSS.HSA-REI.B.4B

Interpret the solutions:

• 2 real solutions

• 2 imaginary solutions

• 1 real solution

• no solutions

Interpret the number of solutions

• 2 real solutions

• 2 imaginary solutions

• 1 real solution

• No solution

How many solutions and what type? -2x² − x − 1 = 0

• 1 real solution

• 2 imaginary solutions

• 2 real solutions

• none of these

Tags

CCSS.HSA-REI.B.4B

CCSS.HSN.CN.C.7

Interpret the solutions:

• 2 real solutions

• 2 imaginary solutions

• 1 real solution

• no solution

Tags

CCSS.HSA-REI.B.4B

Solve using the quadratic formula

• A 
• B 
• C 
• D 

Tags

CCSS.HSA-REI.B.4B

In the equation
y = x² +5x +7, match each leading coefficient with its correct letter 

• a=0, b=5, c=7
• a=1, b=5, c=7
• a=7, b=5, c=1

Which method is best for solving this equation? x²+4x+3=0

• Solve by factoring

• Solve by square root

• Solve by quadratic formula

• none

Tags

CCSS.HSA-REI.B.4B

What method is best for solving this equation? x²+6x=10

• Solve by factoring

• Solve by square root

• Solve by quadratic formula

• none

Tags

CCSS.HSA-REI.B.4B

What method is best for solving this equation? 5x²+12=0

• Solve by factoring

• Solve by square root

• Solve by quadratic formula

• none

Tags

CCSS.HSA-REI.B.4B