Factor the four-term polynomial by grouping.6x4 + 10x2 - 9x2 - 15

A. (2x2 - 3)(3x2 + 5)
B. (2x4 - 3)(3x + 5)
C. (2x2 + 3)(3x2 - 5)
D. (6x2 + 3)(x2 - 5)

Answer: A

Mathematics

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Sketch the indicated set. Describe the boundary of the set. Finally, state whether the set is open, closed or neither.{(x, y) : 1 < (x - 2)2 + y2 ? 3}

A.

The boundaries are two circles, one of
radius 1 and the other of radius 3, both
centered at (2, 0). The set is neither closed or open.
B.

The boundary is the circle of radius 3
centered at (2, 0). The interior is the
set of all points within the circle.
The set is open.
C.

The boundary is the circle of radius 1
centered at (2, 0). The interior is the set
of all points within the circle.
The set is closed.
D.

The boundaries are two circles, one of
radius 1 and the other of radius 3, both
centered at (2, 0). The interior is the set
of all points in between the two circles.
The set is closed.