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What is the value of 3x^2 - 1.3x -0.9 when x=0.2

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Abhi077

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What is the value of 3x^2 - 1.3x -0.9 when x=0.2 [#permalink]

27 Sep 2018, 11:03

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A

B

C

D

E

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71% (01:34) correct

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What is the value of 3x^2 - 1.3x -0.9 when x=0.2
A)-3.38
B)-2.30
C)-1.04
D)-0.76
E)-0.04

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Re: What is the value of 3x^2 - 1.3x -0.9 when x=0.2 [#permalink]

27 Sep 2018, 11:25

1

Kudos

Consider x as 2/10 for easy simplification.

Then 3\(x^2\) - 1.3x -0.9 becomes 3*\(\frac{4}{100}\)-1.3*\(\frac{2}{10}\)-0.9 = 12/100-2.6/10-0.9 = -104/100 = -1.04.

C is the answer.

ScottTargetTestPrep

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Re: What is the value of 3x^2 - 1.3x -0.9 when x=0.2 [#permalink]

02 Oct 2018, 18:34

Expert Reply

Abhi077 wrote:

What is the value of 3x^2 - 1.3x -0.9 when x=0.2
A)-3.38
B)-2.30
C)-1.04
D)-0.76
E)-0.04

Since x = 0.2 we have:

3(0.2^2) - 1.3(0.2) - 0.9

3 x 0.04 - 0.26 - 0.9

0.12 - 0.26 - 0.9 = -1.04

Answer: C
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Re: What is the value of 3x^2 - 1.3x -0.9 when x=0.2 [#permalink]

02 Oct 2018, 18:34

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