crybloodwing
New member
- Joined
- Aug 22, 2017
- Messages
- 29
So I have a problem, and I believe I got the right answer, however the teacher says something different and I am not sure if I am wrong, or he wrote the answer wrong.
So Curve C=r(t)=<2-(t^2), 2t-1, ln t)
We want a point on C that intersects the XZ plane, so we want y=0.
so 2t-1=0
2t=1
t=.5
Then I put t back into the other points.
x=2-(.5^2)
x=2-.25
x=1.75
Teacher said X was 7/4, which is the same value as what I got.
Y still = 0
Z=ln(.5)
However, the teacher said z=ln(2), which is the same value, except it is positive, while .5 is negative.
My point: (1.75, 0, ln(.5))
Teacher's Point: (1.75, 0, ln(2))
Any help? Am I right and the teacher wrote the z-value wrong? Or did I miss a step or logic somewhere?
So Curve C=r(t)=<2-(t^2), 2t-1, ln t)
We want a point on C that intersects the XZ plane, so we want y=0.
so 2t-1=0
2t=1
t=.5
Then I put t back into the other points.
x=2-(.5^2)
x=2-.25
x=1.75
Teacher said X was 7/4, which is the same value as what I got.
Y still = 0
Z=ln(.5)
However, the teacher said z=ln(2), which is the same value, except it is positive, while .5 is negative.
My point: (1.75, 0, ln(.5))
Teacher's Point: (1.75, 0, ln(2))
Any help? Am I right and the teacher wrote the z-value wrong? Or did I miss a step or logic somewhere?