Quadratic Equations and complex numbers

Solve by square root method

 $2x^2+2=34$  

• x = 4, -4

• x = 3, -3

• x = 5, -5

• x = 4

Tags

CCSS.HSA-REI.B.4B

 $-\frac{x^2}{4}+3=19$  

•  $x=\pm i\sqrt{8}$  

•  $x=\pm8$  
  

•  $x=\pm8i$  

•  $x=8i$  

Tags

CCSS.HSA-REI.B.4B

CCSS.HSN.CN.C.7

 $3\left(x+4\right)^2=81$  

•  $x=-4\pm3\sqrt{3}$  

•  $x=-4\pm9i$  

•  $x=-4\pm9\sqrt{3}$  

•  $x=-4\pm3i$  

Tags

CCSS.HSA-REI.B.4B

Solve by the Square Root Method:

(x - 2) ² = 49

• 9 or -5

• ± 9

• ± 5

• ± 7

Tags

CCSS.HSA-REI.B.4B

What is this formula?

• This is the speed of light formula.
• This is the quadratic formula.
• This is the zero product property.
• This is scary.

Tags

CCSS.HSA-REI.B.4B

Determine the values of a, b, and c for the quadratic equation:

 $4x^2-8x-3=0$  

• a=4, b=-8, c=3

• a=4, b=-8, c=-3

• a=4, b=8, c=3

• a=4, b=8, c=-3

Tags

CCSS.HSA.REI.B.4

What should you do first in solving this equation?

 $x^2+6x-13=3$  

• Get factored form.

• Write down: a=1, b=6, c=-13

• Make it equal to 0 by subtracting 3 on each side.

• Type it all in a calculator.

Tags

CCSS.HSA-REI.B.4B

Solve using the Quadratic Formula:    $x^2+12x+4=0$  

•  $x\ =\ 6\pm8\sqrt{2}$  

•  $x=-12\pm8\sqrt{2}$  

•  $x=-6\pm4\sqrt{2}$  

•  $x=-12\pm2\sqrt{8}$  

Tags

CCSS.HSA-REI.B.4B

Solve using the Quadratic Formula:   $-20x=4x^2+25$  

•  $x=\pm\frac{5}{2}$  

•  $x=-\frac{5}{2}$  

•  $x=\frac{20\pm20\sqrt{2}}{-8}$  

•  $x=\frac{-10\pm10\sqrt{2}}{5}$  

Tags

CCSS.HSA-REI.B.4B

Solve the following quadratic equation:

 $x^2+3x+2=0$  

• x = -1, x = -2

• x =1, x = 2

• x = -1, x = 2

• x = 1, x = -2

Tags

CCSS.HSA-REI.B.4B