The size of two matrices is given. Find the size of the product AB and the product BA, if the products exist.A is 2 × 1, B is 1 × 1.
A. AB is 2 × 1, BA is undefined.
B. AB is 1 × 2, BA is 1 × 1.
C. AB is undefined, BA is 1 × 2.
D. AB is 2 × 2, BA is 1 × 1.
Answer: A
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Perform the indicated operations. Write the result in the form a + bj.
2
A. -32 + 126j B. 32 + 126j C. 32 + 2j D. 32
Rotate the axes so that the new equation contains no xy-term. Discuss the new equation.5x2 - 6xy + 5y2 - 8 = 0
A. ? = 45°
- y'2 = 1
hyperbola
center at (0, 0)
transverse axis is the x'-axis
vertices at (±2, 0)
B. ? = 45°
y'2 = -4x'
parabola
vertex at (0, 0)
focus at (-1, 0)
C. ? = 45°
+ y'2 = 1
ellipse
center at (0, 0)
major axis is the x'-axis
vertices at (±2, 0)
D. ? = 45°
x'2 = -4y'
parabola
vertex at (0, 0)
focus at (0, -1)
Solve the problem.Estimate 16% of 51.
A. 51.16 B. 3.19 C. 816 D. 8.16
Multiply or divide as indicated. Write the answer in lowest terms.
÷ 
A. 1
B. 
C. 
D. 