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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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New post 27 Sep 2018, 11:03
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A
B
C
D
E

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

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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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New post 27 Sep 2018, 11:25
1
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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New post 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

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

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