- #1
indio1
- 2
- 0
I was given the equation: 2sqrt(2)(x+y)^2=7x+9y
I need to then:
a)Use rotation of axes to show that the following equation represents a parabola
b) Find the XY- and xy- coordinates of the vertex and focus
c) Find the equation of the directrix in XY- and xy-coordinates
Formulas provided:
General Equation of a Conic
Ax^2+Bxy+Cy^2+Dx+Ey+F=0
cot2(fi) =A-C/B
x=Xcos(fi)-Ysin(fi)
y=Xsin(fi)+Ycos(fi)
So, I got up to a certain point but now I am unsure as to what I must do.
I solved for fi, which equals 45 degrees
I solved for x and y which is
x= X/sqrt(2) -Y/sqrt(2)
y= X/sqrt(2)+Y/sqrt(2)
I think I should plug it into the original equation to get x^2=4py or y^2=4px?
Then I am just oblivious as to how I should solve for directrix and vertex,focus for XY, and xy
Any help would be appreciated
This section is new to me so I am working on learning the fundamentals of this section and this touches upon all aspects of the section.
I need to then:
a)Use rotation of axes to show that the following equation represents a parabola
b) Find the XY- and xy- coordinates of the vertex and focus
c) Find the equation of the directrix in XY- and xy-coordinates
Formulas provided:
General Equation of a Conic
Ax^2+Bxy+Cy^2+Dx+Ey+F=0
cot2(fi) =A-C/B
x=Xcos(fi)-Ysin(fi)
y=Xsin(fi)+Ycos(fi)
So, I got up to a certain point but now I am unsure as to what I must do.
I solved for fi, which equals 45 degrees
I solved for x and y which is
x= X/sqrt(2) -Y/sqrt(2)
y= X/sqrt(2)+Y/sqrt(2)
I think I should plug it into the original equation to get x^2=4py or y^2=4px?
Then I am just oblivious as to how I should solve for directrix and vertex,focus for XY, and xy
Any help would be appreciated
This section is new to me so I am working on learning the fundamentals of this section and this touches upon all aspects of the section.