Ch.17 - Quadratics Review

If
 $f\left(x\right)=x^2-3x-15$  
Find f (1)

• -17

• 17

• 13

• -11

If
 $f\left(x\right)=x^2-3x-15$  
Find x such that f (x) = 0.

• x = -2.65 or 5.65

• x = 2.65 or -5.65

• x = -3 or 6

• x = 3 or -6

For the quadratic function $y=-2\left(x-1\right)\left(x+3\right)$  
Which direction does the parabola open?

• Up

• Down

For the quadratic function $y=-2\left(x-1\right)\left(x+3\right)$  
What are the x-intercepts?

• x = -1 and 3

• x = 1 and -3

• x = 1/2 and -3/2

• x = -1/2 and 3/2

For the quadratic function $y=-2\left(x-1\right)\left(x+3\right)$  
What is the y-intercept?

• 0

• 6

• -1

• 3

• -6

For the quadratic function $y=-2\left(x-1\right)\left(x+3\right)$  
Find the axis of symmetry.

• 3

• x = 1

• x = -1

• 1

• -1

Find the x-intercept(s) of the following function: $y=3x^2-12x$  

• x = 0
  x = 4

• x = 0
  x = -4

• x = 0.09
  x = 3.91

• x = 0.09
  x = -3.91

• No real solutions

Find the x-intercept(s) of the following function: $y=3x^2-x-10$  

• x = -5/3
  x = 2

• x = 5/3
  x = -2

• x = 1.83
  x = -1.83

• x = 1.83

• No real solutions

Find the x-intercept(s) of the following function: $y=x^2-11x-60$  

• x = -4
  x = 15

• x = -15
  x = 4

• x = -3
  x = 20/3

• x = -3

• No real solutions

Find, in the form $y=ax^2+bx+c$  , the quadratic function whose graph touches the x-axis at 4 and passes through the point (2, 12).

•  $y=3x^2-24x+48$  

•  $y=2\left(x-4\right)^2+12$  

•  $y=2\left(x+4\right)^2+12$  

•  $y=2x^2-4x+12$