quadratic function (standard form)

Which of the following equations matches standard form of a quadratic?

• ax + by = c
• y = a(x - h)² + k
• y = ax² + bx + c
• y = mx + b

What is the "formula" for finding the axis of symmetry? 

•  $y=ax^2+bx+c$  

•  $x=\frac{-b}{2a}$  

•  $y=mx+b$  

•  $x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$  

What is the vertex of y=x²+4x+3?

• (2,1)
• (-2,1)
• (0,0)
• (-2,-1)

Find the y-intercept of the function: $f\left(x\right)=-2x^2+15x-4$  

• -2

• -4

• 9

• 11

Tags

CCSS.HSF-IF.C.7A

Find the line of symmetry for the function: $f\left(x\right)=-2x^2+15x-4$  

•  $x=-\frac{15}{4}$  
  

•  $x=\frac{15}{4}$  
  

•  $y=\frac{15}{4}$  

•  $y=-\frac{15}{4}$