All of the following expressions have the same value, when x = -2 and y = 4, except _____.

A) x 2y
B)(-2) 2y
C)-4x 2
D)-2xy

Question

14-02-2018
Mathematics

contestada

All of the following expressions have the same value, when x = -2 and y = 4, except _____.

A) x 2y
B)(-2) 2y
C)-4x 2
D)-2xy

Respuesta :

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JonHenderson55 JonHenderson55 · Answer 1 · 2018-02-21T11:08:04+01:00

The correct answer is: [D]: " - 2xy " .
______________________________________________________

Explanation:
____________________________________________________
Let us consider the value of each of the answer choices;

Given: " x = -2 " ; and: " y = 4 " ;
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Choice [A]: " x * 2y = -2 * (2 * 4) = -2 * 8 = -16 .
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Choice [B]: " (-2)* (2y) = (-2) * (2 * 4) = -2 * 8 = -16 .
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Choice [C]: " -4x * 2 = -4(-2) * 2 = -8 * 2 = -16
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Choice [D]: " -2xy = (-2 * -2 * 4) = 4 * 4 = 16.
____________________________________________________

→ The answer is: Choice [D]: " -2xy " .
____________________________________________________

→ When "x = -2 " ; and "y = 4" ;

→ Answer choices [A], [B], and [C] have the same value: " -16 " .

→ Answer choice [D]: The value is different: "16" {"positive 16" .}.
____________________________________________________

14ZYB0N3S 14ZYB0N3S · Answer 2 · 2020-09-08T18:34:45+02:00

14ZYB0N3S 14ZYB0N3S

08-09-2020

The answer is C.

I know this because D is not correct, and it counted it wrong on my lesson.

I also know this because A & B equal -16.

Therefore, C is correct.

Hopefully I got this right.

Answer Link

All of the following expressions have the same value, when x = -2 and y = 4, except _____. A) x 2y B)(-2) 2y C)-4x 2 D)-2xy

Respuesta :

Otras preguntas

All of the following expressions have the same value, when x = -2 and y = 4, except _____.

A) x 2y
B)(-2) 2y
C)-4x 2
D)-2xy