Solve the equation in the complex number system.x4 - 2x2 - 3 = 0
A. {-
i, -i}
B. {
i, i}
C. {
, 3}
D. {- 
, 
, i, -i}
Answer: D
Mathematics
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Find the cardinal number of the indicated set. Use the cardinal number formula.If n(A) = 4, n(B) = 9 and n(A ? B) = 2, what is n(A ? B)?
A. 13 B. 11 C. 12 D. 10
Mathematics
Evaluate the expression for the given replacement values.2x2 + 6y for x = 9, y = 10
A. 222 B. 384 C. 254 D. 1740
Mathematics
Graph the rational function.f(x) = 
A. 
B. 
C. 
D. 
Mathematics
Write an expression that gives all solutions to the equation.
?
?
A. 
B. 
C. 
D. 
E. 
Mathematics