Introduction to Solving Quadratics by the Quadratic Formula

Solve by factoring: x² - 9x + 20 = 0

• x = -4 and x = -5
• x = 20 and x = -9
• x = 4 and x = 5
• x = -4 and x = 5

Solve by factoring: x² + 3x - 18 = 0

• x = -3 and x = 6
• x = 3 and x = -6
• x = -9 and x = 2
• x = 9 and x = -2

Solve by factoring:

 $15t^2-3t\ =\ 3-7t$  

•  $t=\ -\frac{3}{5},\ \frac{1}{3}$  
  

•  $t=-3,\ \frac{5}{3}$  
  

•  $t=-\frac{1}{3},\ \frac{3}{5}$  
  

•  $t=-\frac{5}{3},\ 3$  
  

Solve:  x² - 81 = 0 

• 9
• 9, -9
• 3, -3, 9, -9
• None of the above

Solve 2x² - 7x + 6 = 0 by factoring

• x = -3/2 and x = -2

• x = -3 and x = -2

• x = 3 and x = 2

• x = 3/2 and x = 2

Evaluate the following expression:
-3x² - 5x + 7 when x = -2

• 5
• 10
• 12
• 7

Evaluate the following expression:
x² + 5 - x when x = 5

• 25
• 33
• 20
• 35

Evaluate the following expression:
t² - t + 1 when t = 5

• 25
• 22
• 23
• 21