Find range of y

BITSAT 2015 Help › Algebra questions › Find range of y

Find range of y:
y=4{x}³-3{x}-1

#Mathematics #Algebra

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6 Answers

33

Abhishek Priyam ·2008-11-02 06:47:31

ok options were:
[-1,0]
[-2,0]
[-2,0)
none

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33

Abhishek Priyam ·2008-11-02 06:48:57

I solved but answer didn't match with the answers in todays test....

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1

Saurabh Agarwal ·2008-11-02 07:09:45

hey my answers are coming all strange figured - is the answer none?

my answers are: [ -5/16, -27/16]

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1

Kumar Saurabh ·2008-11-02 07:43:48

is the answer (c)

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62

Lokesh Verma ·2008-11-02 09:31:51

y=4{x}³-3{x}-1

this will have the same range as :
y = 4x³-3x-1 (for x in [0,1)

the maxima or minima will have to be found for y = 4x³-3x-1 (for x in [0,1)

derivative is zero gives 12x²-3

so x=Â±1/2

so we need to check the end points and this point

f(0) = -1

f(1) = 0 (this will not reach 0)

f(1/2) = -2

so range will be [-2,0)

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33

Abhishek Priyam ·2008-11-02 09:43:57

Oh was confusing b/w b and c but now got it....

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Your Answer

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