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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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02 Jul 2017, 11:05
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If x = -3, what is the value of -3x^2?

(A) —27
(B) —18
(C) 18
(D) 27
(E) 81

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

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02 Jul 2017, 11:08
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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02 Jul 2017, 11:08
carcass wrote:
If x = —3, what is the value of — $$3x^2$$?

(A) —27
(B) —18
(C) 18
(D) 27
(E) 81

$$x = -3$$

—$$3x^2$$

—$$3(-3)^2$$

—$$3*9$$

—$$27$$

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

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03 Jul 2017, 10:43
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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

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

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04 Jul 2017, 20:11
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
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Re: If x = -3, what is the value of -3x^2?  [#permalink]

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05 Jul 2017, 07:28
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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14 Jul 2017, 09:48
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.

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

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01 Feb 2019, 18:47
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Re: If x = -3, what is the value of -3x^2?   [#permalink] 01 Feb 2019, 18:47
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