Algebra: Homework: Intro to Quadratics

Which equation represents a quadratic function?

• $f\left(x\right)=x^2-\sqrt{4x}+1$

• $f\left(x\right)=2x^2+4x-8$

• $f\left(x\right)=3x-4$

Which quadratic is written in standard form?

•  $y=3x-6+x^2$  

•  $y=5+2x-4x^2$  

•  $y=6x^2+5+2x$  

•  $y=3x^2-2x+8$  

Does the graph have a minimum or a maximum?

• minimum
• maximum

State the leading coefficient of the following polynomial: $y=-4x^2+3x-5x^4+2$  

• -4

• 3

• -5

• These coefficients are too weak to lead.

What do we call the highest or lowest point of a quadratic?

• parabola
• vertex
• graph
• point

Which of the following is the vertex of the graph?

• (2, 0)
• (-2, 0)
• (0, 4)
• (-1, 3)

What is the green dashed line called?

• roots or x-intercepts

• parabola

• axis of symmetry

• y intercept

What is the axis of symmetry for this graph? 

• x = 2
• x = -4
• y = -4
• there is not one

What direction is the following equation opening?

 $y=4x^2-3x-5$  

• Up

• Down

• Left

• Right

Which equation do you use to find the axis of symmetry?

• $y=mx+b$
  

• $x=-\frac{b}{2a}$
  

• $x=-b\left(a\right)2$
  

• $y=-\frac{b}{2a}$