Oct 15th Warm Up

What are the factors of:

25x² - 81?

• (5x - 9)(5x + 9)

• (5x - 9)(5x - 9)

• (5x + 9)(5x + 9)

• Cannot be factored

Factor completely:

k² -2k - 24

• (k+4)(k-6)

• (k+4)(k+6)

• (k+6)(k-1)

• (k-4)(k+6)

Factor completely:
 3x² + 5x - 12

• (3x + 4)(x-3)
• (3x - 4)(x + 3)
• (3x + 3)(x -4)
• (3x - 3)(x + 4)

Factor completely:

 $7x^2-49x$  

•  $7\left(x^2-7x\right)$  

•  $\left(7x\ -\ 1\right)\left(x\ -\ 7\right)$  

•  $7x\left(x-7\right)$  

•  $49x\left(7x\ -\ 1\right)$  

Solve using the square root method:

2(x - 3)² - 14 = 18

• {1, 7}

• {-1, 7}

• {-1, -7}

• {1, -7}

Solve by factoring:

4m² - 100 = 0

• m=25, -25

• m=96

• m=5, -5

• m=-96

Solve by factoring:

a² + 2a - 24 = 0

• {-6, 4}

• {6, -4}

• {12, -2}

• {8, -3}

Solve by factoring:

2x² + 17x + 21 = 0

• x= ^-21/₂, -17

• x= ²/₃, 16

• x=-7, ^-3/₂

• x=15, -³/₇

Solve the following:
 $8x^2-16x=0$  

• {-2, 0)

• (2, -2}

• {0, 2} 

• {2, 8}