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For all values of x, y, and z, x ◊ y ◊ z = x2(y − 1)(z + 2).

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For all values of x, y, and z, x ◊ y ◊ z = x2(y − 1)(z + 2).  [#permalink]

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New post 28 May 2018, 10:53
7
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

65% (02:06) correct 35% (01:54) wrong based on 102 sessions

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For all values of x, y, and z, \(x ◊ y ◊ z\) = \(x^2(y − 1)(z + 2).\)
If a < 0, which of the following shows R, S, and T arranged in order from least to greatest?
R: \(1 ◊ a ◊ 3\)
S: \(3 ◊ a ◊ 1\)
T: \(a ◊ 3 ◊ 1\)

A) R, S, T
B) T, S, R
C) R, T, S
D) T, R, S
E) S, R, T

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Re: For all values of x, y, and z, x ◊ y ◊ z = x2(y − 1)(z + 2).  [#permalink]

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New post 28 May 2018, 11:08
Option E

a<0

If a = -1:

R: 5(a-1) = -10
S: 27(a -1) = -54
T: 6\(a^2\) = 6

> S, R, T
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Re: For all values of x, y, and z, x ◊ y ◊ z = x2(y − 1)(z + 2).   [#permalink] 28 May 2018, 11:08
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For all values of x, y, and z, x ◊ y ◊ z = x2(y − 1)(z + 2).

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