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Find the vertex , the focus , and the directrix , Draw the graph of * + 6* + by + 21 = 0 The focus ( Typo an ordered pair . ) What is the directrix ?...

please help me understand so i may assist my daughter so she can understand


2018-12-02 (25).png

2018-12-02 (25).png

Find the vertex , the focus , and the directrix , Draw the graph of
* + 6* + by + 21 = 0
The focus
( Typo an ordered pair . )
What is the directrix ? Select the correct choice below and fill in the answer
box to complete your choice
A . The directrix isy
10 8
B . The directrix is
Use the graphing tool to graph the equation

Top Answer

Thus foci is (-3,-  ​ 2 ​ ​ 7... View the full answer

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10 comments
  • please verify the "focus"
    • ggrunspan
    • Dec 02, 2018 at 9:08pm
  • hi the focus is correct it is (-3,-7/2) or maybe yo have to write (-3,-3.5)
    • gupta.vrinda
    • Dec 02, 2018 at 9:11pm
  • thank you that was accurate and how do you plot the graph into the way you got it?
    • ggrunspan
    • Dec 02, 2018 at 9:20pm
  • actually my online software did it itself i just wrote the equation x^2+6x+6y+21=0
    • gupta.vrinda
    • Dec 02, 2018 at 9:26pm
  • meaning a math editor?
    • ggrunspan
    • Dec 02, 2018 at 9:33pm
  • online graphing calculator
    • gupta.vrinda
    • Dec 02, 2018 at 9:36pm
  • i will see if i can do it on a graphing calculator and see if it gives me the step by step to follow the lines
    • ggrunspan
    • Dec 02, 2018 at 9:37pm
  • yes other you just siply first write the equation x^2+6x+6y+21=0 ..this will give parabola
    • gupta.vrinda
    • Dec 02, 2018 at 9:39pm
  • then mark the point (-3,-3.5)....this will give foci
    • gupta.vrinda
    • Dec 02, 2018 at 9:39pm
  • next draw the line y=-1/2 this will give directrix
    • gupta.vrinda
    • Dec 02, 2018 at 9:39pm

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