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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 ?...

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
A . The directrix isy
10 8
B . The directrix is
Use the graphing tool to graph the equation

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

• 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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