Rotate the axes so that the new equation contains no xy-term. Discuss the new equation.31x2 + 10
xy + 21y2 -144 = 0
A. ? = 36.9°
+ 
= 1
ellipse
center at (0, 0)
major axis is x'-axis
vertices at (±3, 0)
B. ? = 45°
y'2 = -4
x'
parabola
vertex at (0, 0)
focus at (-
, 0)
C. ? = 45°
x'2 = -4
y'
parabola
vertex at (0, 0)
focus at (0, -
)
D. ? = 30°
+ 
= 1
ellipse
center at (0, 0)
major axis is y'-axis
vertices at (0, ±3)
Answer: D
Mathematics
You might also like to view...
Divide. Express the quotient in lowest terms.
÷ 
A. 
B. 
C. 
D. 
Mathematics
Express the vector as a product of its length and direction.4j - 3k
A. 5
B. 5(j - k)
C. 5
D. 25
Mathematics
Solve by any method.16x4 - 41x2 + 25 = 0
A. 
B. 
C. 
D. 
Mathematics
Solve the combined inequality and graph the solution set. Write the solution in interval notation.3x + 5 < 5x + 3 < 10x - 1
A. 
B. 
C. ?
D. (-?, ?)
Mathematics