Solve by completing the square to obtain exact solutions.16x2 + 56x + 13 = 0
A. - 
, - 
B. - 
, - 
C. - 
, 
D. 
, 
Answer: B
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Rotate the axes so that the new equation contains no xy-term. Discuss the new equation.x2 + xy + y2 - 3y - 6 = 0
A. ? = 45°
+ 
= 1
ellipse
center at (0, 0)
major axis is y'-axis
vertices at (0, ±2)
B. ? = 45°
+ 
= 1
ellipse
center at (
, 
)
major axis is y'-axis
vertices at (
, - 
) and (
, 
)
C. ? = 45°
y'2 = -18x'
parabola
vertex at (0, 0)
focus at (- 
, 0)
D. ? = 45°
- 
= 1
hyperbola
center at (0, 0)
transverse axis is the x'-axis
vertices at (±
, 0)
An observer is 300 feet from a hot air balloon before it lifts off. Determine the angle of elevation, ?, when the balloon reaches a height of feet. State your answer in degrees and round to one decimal place.
Find the product AB.A = 
, B = 
A. 
B. 
C. 
D. 
Simplify the rational expression. If the rational expression cannot be simplified, so state.
A. 
B. x + 12
C. 
D. cannot be simplified