10/21 Practice Quadratic Forms #3

Use the function:

 $f\left(x\right)=3\left(x+7\right)\left(x+5\right)$  
What form is the quadratic function in?

• Stadandard Form

• Vertex Form

• Intercept Form

• Slope Form

Use the function:

 $f\left(x\right)=3\left(x+7\right)\left(x+5\right)$  
What are the x-intercept(s)?

• (-7,0) and (-5,0)

• (7,0) and (5,0)

• (7,5)

• (0,3) and (0,-5)

Use the function:

 $f\left(x\right)=3\left(x+7\right)\left(x+5\right)$  
What is the axis of symmetry?

• x=3

• x=6

• x= -6

• x= -3

Use the function:

 $f\left(x\right)=3\left(x+7\right)\left(x+5\right)$  
What is the vertex?

• (4,3)

• (-6,-3)

• (6,3)

• (-3,4)

Use the function:

 $f\left(x\right)=3\left(x+7\right)\left(x+5\right)$  
What is the y-intercept?

• (0,16)

• (0,7)

• (0,105)

• (0,55)

Use the function:

 $f\left(x\right)=3\left(x+7\right)\left(x+5\right)$  
What is the Increasing interval?

•  $\left(-6,\infty\right)$  
  

•  $\left(-\infty,-6\right)$  

•  $\left(-\infty,-7\right)\ \left(-5,\infty\right)$  

• (-7,-5)

Use the function:

 $f\left(x\right)=3\left(x+7\right)\left(x+5\right)$  
What is the decreasing interval?

•  $\left(-6,\infty\right)$  
  

•  $\left(-\infty,-6\right)$  

•  $\left(-\infty,-7\right)\ \left(-5,\infty\right)$  

• (-7,-5)