Find the points at which the curve + 6xy + 5 = 80 has horizontal tangent lines.
A) (3, -5) and (-3, 5)
B) (3, 5), (5, -3), (-3, 5), and (-5, -3)
C) (5, -3) and (-5, 3)
D) (3, 5), (3, -5), (-3, 5), and (-3, -5)
E) The curve does not have horizontal tangent lines.

Question

Find the points at which the curve  + 6xy + 5  = 80 has horizontal tangent lines.
A) (3, -5) and (-3, 5) 
B) (3, 5), (5, -3), (-3, 5), and (-5, -3) 
C) (5, -3) and (-5, 3) 
D) (3, 5), (3, -5), (-3, 5), and (-3, -5) 
E) The curve does not have horizontal tangent lines.

Quizplus · Accepted Answer

The Answer of Find the points at which the curve  + 6xy + 5  = 80 has horizontal tangent lines.
A) (3, -5) and (-3, 5) 
B) (3, 5), (5, -3), (-3, 5), and (-5, -3) 
C) (5, -3) and (-5, 3) 
D) (3, 5), (3, -5), (-3, 5), and (-3, -5) 
E) The curve does not have horizontal tangent lines.

Find the Points at Which the Curve + 6xy