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

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

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

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

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

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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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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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E-mail : kinshook.chaturvedi@gmail.com Re: If x = -3, what is the value of -3x^2 ?   [#permalink] 15 Sep 2019, 07:04
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