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555-605 (Medium)|   Algebra|   Arithmetic|      
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Bunuel
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GMAT Club Around The World!!! When x = 0.2, what is the value of 3x^2- 01 Jan 2021, 01:00
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C
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77% (01:42) correct 23% (01:42) wrong based on 187 sessions

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When x = 0.2, what is the value of \(3x^2-1.3x-0.9\)?

A. -3.38
B. -2.30
C. -1.04
D. -0.76
E. -0.04



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C
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GMAT 2: 760 Q50 V42
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GMAT Club Around The World!!! When x = 0.2, what is the value of 3x^2- 01 Jan 2021, 01:16
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My answer is (C).

By performing manual computation.
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GMAT Club Around The World!!! When x = 0.2, what is the value of 3x^2- 01 Jan 2021, 01:28
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IMO B

\(x^2 = 0.04\)

\(3*x^2 - 1.3 x - 0.9\)
= 3*0.04 - 1.3 * 0.2 - 0.9
= 0.12 - 0.26 - 0.9
= -0.14 - 0.9
= -2.3
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GMAT Club Around The World!!! When x = 0.2, what is the value of 3x^2- 01 Jan 2021, 05:13
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When x = 0.2, what is the value of 3x2−1.3x−0.93x2−1.3x−0.9?

A. -3.38
B. -2.30
C. -1.04
D. -0.76
E. -0.04

answer is c ) -1.04

just substitute x =.2 in expression and we get the asnwer
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GMAT Club Around The World!!! When x = 0.2, what is the value of 3x^2- 01 Jan 2021, 05:21
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Let's push C
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GMAT Club Around The World!!! When x = 0.2, what is the value of 3x^2- 01 Jan 2021, 08:57
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3\(x^2\) = 3*.2*.2 = 0.12
1.3x = 1.3*.2 = .26

3\(x^2\) - 1.3x - 0.9 = 0.12 - 0.26 - 0.9 = -1.04

IMO Option C
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GMAT Club Around The World!!! When x = 0.2, what is the value of 3x^2- 02 Jan 2021, 06:13
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Given, 3x^2−1.3x−0.9 at x=0.2

= 3*0.04-0.26-0.9 = 0.12-0.26-0.90 = -1.04. So, It is C. :)
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GMAT Club Around The World!!! When x = 0.2, what is the value of 3x^2- 02 Jan 2021, 06:23
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Correct Answer C
When x = 0.2, what is the value of 3x2−1.3x−0.9?

3x^2−1.3x−0.9
=x(3*0.2 -1.3) -0.9
=0.2*-0.7 -0.9
=-1.04
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GMAT Club Around The World!!! When x = 0.2, what is the value of 3x^2- 04 Jan 2021, 10:19
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To make the calculation easy I will convert the decimal form into fraction form
x = 0.2 = 2/10
3x^2 - 1.3x - 0.9
3x^2 - 13x/10 - 9/10
Substituting the value of x in the equation
3* (2/10)^2 - (13/10)*(2/10) - 9/10
= 3*(4/100) - 26/100 - 9/10
= 12/100 - 26/100 - 9/10
= -104/100
= -1.04
The correct answer will be C
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GMAT Club Around The World!!! When x = 0.2, what is the value of 3x^2- 22 Jan 2026, 05:29
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