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

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

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27 Sep 2018, 11:03

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Difficulty:

25% (medium)

Question Stats:

71% (01:35) correct

29% (01:50) wrong

based on 80 sessions

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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

Spoiler: OA

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

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27 Sep 2018, 11:25

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.

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

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02 Oct 2018, 18:34

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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