Solve the system by using Gaussian elimination with backward substitution or by reducing the matrix to reduced-row echelon form. x - y + 3z = -13x + z = -2 x + 4y + z = -22
A. (-2, -5, 0)
B. No solution
C. (0, -5, -2)
D. (-2, 0, -5)
Answer: C
Mathematics
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Use < or > for ? to write true sentence.
? 
A. < B. >
Mathematics
Rationalize the denominator. Assume that all variables represent positive real numbers and that the denominator is not zero.
A. 6
B. 6
C. 
D. 
Mathematics
Solve the polynomial equation in the complex numbers.x3 + 2x2 - 6x + 8 = 0
A. {-4, 4} B. {1 + i, 1 - i, 4i} C. {1 + i, 1 - i, 4} D. {1 + i, 1 - i, -4}
Mathematics
Simplify. Write your answers in the form of a+bi, where a and b are real numbers.(8 + 
) (6 + 
)
A. 132 i B. 132 C. 372 + 342i D. 30 + 66i
Mathematics