Find all relative extrema for the function, and then match the equation to its graph.
z = y4 - 2y2 + x2 - 
A. Relative maxima of 
at (0, 1) and at (0, -1);
saddle point at (0, 0)
B. Relative maxima of 
at (0, 1) and at (0, -1);
saddle point at (0, 0)
C. Relative minima of - 
at (0, 1) and
at (0, -1); saddle point at (0, 0)
D. Saddle points at (0, 0), (-1, 1), (1, -1), (1, 1),
and (-1, -1)
Answer: C
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Rationalize the denominator and simplify. Assume all variables represent nonnegative real numbers.
A. 
B. 
C. 20
D. 3
Solve the equation. Express radicals in simplest form.x2 = 9 - 4x
A. {-2 + 2
, -2 - 2
}
B. {-1 + 
, -1 - 
}
C. {-2 + 
, -2 - 
}
D. {2 + 
}
Solve the problem.The profit made when t units are sold, t > 0, is given by 
Determine the number of units to be sold in order for P < 0 (a loss is taken).
A. t > 0 B. 14 < t < 15 C. t < 14 or t > 15 D. t = 14 or t = 15
Solve the equation by the square root property.(x - 7)2 = 36
A. {43} B. {-6, 6} C. {-13, 1} D. {1, 13}