Applying and analysing quadratic functions

10. What are the positive and negative intervals of: $-x^2-2x\ -4$ 

• Positive:  $\left(-\infty,\ \infty\right)\ or\ All\ Real\ Numbers$  
  
  Negative: $Never!$  

• Positive:  $\left(-\infty,\ \infty\right)\ or\ All\ Real\ Numbers$  

  
  
  

  Negative: $\left(-1,\ -3\right)$  

• Positive:  $Never!$   
  
  Negative:  $\left(-\infty,\ \infty\right)\ or\ All\ Real\ Numbers$  

• Positive:  $Never!$  

  
  
  

  Negative: $\left(-1,\ -3\right)$   

Find the equation of the quadratic function with the given zeros: (2,4)

• x²-6x-8
• x²+6x-8
• x²-6x+8
• x²+6x+8

What factors represent the following graph?

• (x - 8) (x +1)

• (x - 4) (x - 2)

• (x - 8) (x + 1)

• (x + 4) ( x + 2)

Numbers = 4, -4

What is the product and the sum?

• Sum = 0

  Product = -16

• Sum = 8

  Product = 16

• Sum = -8

  Product = -16

• Sum = 0

  Product = 16

Match the following

• 4A 3B 1C 2D

• 3A 1B 2C 4D

• 1A 2B 3C 4D

• 4A 3B 2C 1D

Which statement about f(x) = 3x² – 10x – 8 is true?

• The zeros are 2/3 and 4, because f(x) = (3x – 2)(x – 4).

• The zeros are 2/3 and -4, because f(x) = (3x + 2)(x – 4).

• The zeros are 2/3 and -4, because f(x) = (3x – 2)(x + 4).

• The zeros are -2/3 and 4, because f(x) = (3x + 2)(x – 4).

y=(x+3)(x-8) has the x-intercepts of ....

• 3 and 8

• -3 and -8

• -3 and 8

• 3 and -8

Find the x-intercepts of the equation 
f(x)=x²+5x-14

• (10,0)  (7,0)
• (-7,0)  (2,0)
• (0,-14)
• (0,-7)  (0,2)

A quadratic function crosses the x-axis at points (-2, 0) and (3, 0).


Its standard form equation is of the form
 $ax^2+bx+c$ 

What is the value of  $b$  ?

•  $-1$  

•  $1$  

•  $-6$  

•  $6$