Solve the problem.3 + 9i is a solution of a quadratic equation with real coefficients. Find the other solution.
A. -3 + 9i
B. 3 + 9i
C. 3 - 9i
D. -3 - 9i
Answer: C
Mathematics
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Simplify by using the distributive law and combining like terms.7x - (2x - 6) - (-7x + 1)
A. 16x + 5 B. 12x + 7 C. 12x - 7 D. 12x + 5
Mathematics
Find the magnitude and direction angle for the following vector. Give the direction angle as an angle in [0°, 360°) rounded to the nearest tenth.
A. 6, 330° B. 9, 150° C. 9, 210° D. 6, 150°
Mathematics
Subtract.(-2r4 + 9r3 - 3r) - (8r4 - 9r3 + 6r2 - 2r)
A. 10r4 - 18r3 + 6r2 + r B. -10r4 + 18r3 - 6r2 - r C. -6r4 - 6r2 + r D. 6r4 + 6r2 - r
Mathematics
Find the x- and y- intercepts.4x + 5y = 20
A. (4, 0), (0, 5) B. (-5, 0), (0, -4) C. (5, 0), (0, 4) D. (5, 0), (0, -4)
Mathematics