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If f(x) = x^4 - 3x^3- 2x^2 + 5x , then f(-1) =

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Bunuel
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If f(x) = x^4 - 3x^3- 2x^2 + 5x , then f(-1) = [#permalink] If f(x) = x^4 - 3x^3- 2x^2 + 5x , then f(-1) =   19 Mar 2015, 06:15
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If f(x) = x^4 - 3x^3- 2x^2 + 5x , then f(-1) =

A. -5
B. -3
C. -1
D. 1
E. 3
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B
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B
peachfuzz
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Re: If f(x) = x^4 - 3x^3- 2x^2 + 5x , then f(-1) = [#permalink] If f(x) = x^4 - 3x^3- 2x^2 + 5x , then f(-1) =   19 Mar 2015, 06:28
(-1)^4 - 3(-1)^3 - 2(-1)^2 + 5(-1)
= 1 + 3 - 2 - 5
= -3
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Re: If f(x) = x^4 - 3x^3- 2x^2 + 5x , then f(-1) = [#permalink] If f(x) = x^4 - 3x^3- 2x^2 + 5x , then f(-1) =   19 Mar 2015, 10:23
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So easy and 500 level question !!

given : f(x) = x^4 - 3x^3 -2x^2 +5x and wanted f(-1) so , we must plug -in -1 n each place in which x is written

so , we have f(-1) : (-1) ^4 - 3 (-1) ^3 -2( -1) ^2 +5 (-1) = 1 -3(-1) -2(1) +5(-1) = 1+3 -2-5 =4-7= -3

Answer :B


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Re: If f(x) = x^4 - 3x^3- 2x^2 + 5x , then f(-1) = [#permalink] If f(x) = x^4 - 3x^3- 2x^2 + 5x , then f(-1) =   23 Mar 2015, 04:51
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Bunuel wrote:
If f(x) = x^4 - 3x^3- 2x^2 + 5x , then f(-1) =

A. -5
B. -3
C. -1
D. 1
E. 3

Kudos for a correct solution.


MAGOOSH OFFICIAL SOLUTION:
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Re: If f(x) = x^4 - 3x^3- 2x^2 + 5x , then f(-1) = [#permalink] If f(x) = x^4 - 3x^3- 2x^2 + 5x , then f(-1) =   25 Apr 2016, 13:05
\(f(x)=x^4-3x^3-2x^2+5x\)
we have to find value for f(-1)
\((-1)^4-3(-1)^3-2(-1)^2+5(-1)\)
it works out to be equal to -3
correct answer option B
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Re: If f(x) = x^4 - 3x^3- 2x^2 + 5x , then f(-1) = [#permalink] If f(x) = x^4 - 3x^3- 2x^2 + 5x , then f(-1) =   08 Aug 2022, 09:44
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Given that f(x) = \(x^4 - 3x^3- 2x^2 + 5x\) and we need to find the value of f(-1)

To find f(-1) we need to compare what is inside the bracket in f(-1) and f(x)

=> We need to substitute x with -1 in f(x) = \(x^4 - 3x^3- 2x^2 + 5x\) to get the value of f(-1)

=> f(-1) = \((-1)^4 - 3(-1)^3- 2(-1)^2 + 5*-1\) = 1 -3*-1 - 2*1 - 5 = 1 + 3 - 2 - 5 = -3

So, Answer will be B
Hope it helps!

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Re: If f(x) = x^4 - 3x^3- 2x^2 + 5x , then f(-1) = [#permalink]
08 Aug 2022, 09:44
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