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If x = -3, what is the value of -3x^2 ?

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If x = -3, what is the value of -3x^2 ?  [#permalink]

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New post 02 Jul 2017, 12:05
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Re: If x = -3, what is the value of -3x^2 ?  [#permalink]

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New post 02 Jul 2017, 12:08
The square of any number is positive, multiplied by a negative number will yield a negative number.
Since x = 3, the expression is \(3^3\)

The value of the expression — \(3x^2\) is -27(Option A)
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Re: If x = -3, what is the value of -3x^2 ?  [#permalink]

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New post 02 Jul 2017, 12:08
carcass wrote:
If x = —3, what is the value of — \(3x^2\)?

(A) —27
(B) —18
(C) 18
(D) 27
(E) 81


\(x = -3\)

—\(3x^2\)

—\(3(-3)^2\)

—\(3*9\)

—\(27\)

Answer (A)...
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Re: If x = -3, what is the value of -3x^2 ?  [#permalink]

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New post 03 Jul 2017, 11:43
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carcass wrote:
If x = -3, what is the value of -3x²?

(A) —27
(B) —18
(C) 18
(D) 27
(E) 81


If x = -3, then -3x² = (-3)x² = (-3)(-3)² = (-3)(9) = -27

Answer:

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Re: If x = -3, what is the value of -3x^2 ?  [#permalink]

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New post 04 Jul 2017, 21:11
carcass wrote:
If x = -3, what is the value of -3x^2?

(A) —27
(B) —18
(C) 18
(D) 27
(E) 81


-3x^2
= -3*(-3)^2
=-3*9
=-27
Answer A
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Re: If x = -3, what is the value of -3x^2 ?  [#permalink]

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New post 05 Jul 2017, 08:28
carcass wrote:
If x = -3, what is the value of -3x^2?

(A) —27
(B) —18
(C) 18
(D) 27
(E) 81


Given : \(x = -3\)

So, \(x^2 = 9\)

Hence, \(-3x^2 = -27\)

Thus, answer will be (A) —27
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Re: If x = -3, what is the value of -3x^2 ?  [#permalink]

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New post 14 Jul 2017, 10:48
carcass wrote:
If x = -3, what is the value of -3x^2?

(A) —27
(B) —18
(C) 18
(D) 27
(E) 81


Since x = -3, -3x^2 = -3(-3)^2 = -3(9) = -27.

Answer: A
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Re: If x = -3, what is the value of -3x^2 ?  [#permalink]

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New post 16 Sep 2018, 22:21
Substituting the value of x in the given equation.

\(x^2\) = \(-3^2\) = 9.

-3*9 = -27

A is the answer.
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Re: If x = -3, what is the value of -3x^2 ?  [#permalink]

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New post 01 Oct 2018, 03:01
Bunuel wrote:
If x = -3, what is the value of -3x^2 ?

A. -27
B. -18
C. 18
D. 27
E. 81


\(-3x^2 = (-3)*(-3)^2 = (-3)*(9) = -27\)

Answer: Option A
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Re: If x = -3, what is the value of -3x^2 ?  [#permalink]

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New post 22 Mar 2019, 12:27
carcass wrote:
If x = -3, what is the value of -3x^2?

(A) —27
(B) —18
(C) 18
(D) 27
(E) 81


for choice C,D,E:
If we square any positive or negative value then we can get definite positive value. And we get a negative value if we multiply that positive value by any negative value(-3).So, C,D,E out.
For choice B:
If we squared any odd number we get odd number, and then multiplied that number by any odd number we can easily get a odd number, which is A not B.
So, the correct choice is .
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Re: If x = -3, what is the value of -3x^2 ?  [#permalink]

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New post 15 Sep 2019, 07:04
carcass wrote:
If \(x = -3\), what is the value of \(-3x^2\)?

(A) -27
(B) -18
(C) 18
(D) 27
(E) 81


Given; \(x = -3\)

Asked: What is the value of \(-3x^2\)?

-3(-3)^2 = -3 *9 = -27

IMO A
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Re: If x = -3, what is the value of -3x^2 ?   [#permalink] 15 Sep 2019, 07:04
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