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6 Apr 2012 12:59:20 IST

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Engineering Entrance , JEE Main , JEE Advanced , Mathematics , Algebra

Suppose abc<0, a+b+c>0 and |a|/a +|b|/b +|c|/c = x , then the value of x^3 + 16x -7.

Comments (4)

saikrishna

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Joined: 31 Mar 2012

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6 Apr 2012 12:59:58 IST

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abc0 means??

saikrishna

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Joined: 31 Mar 2012

Posts: 81

6 Apr 2012 13:01:27 IST

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10 i think

Vivek Kumar Singh

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6 Apr 2012 13:04:12 IST

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how ??

boywholived

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6 Apr 2012 13:09:53 IST

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The definition for modulus function is

_{x if x>0}

mod(x)=

-x if x<0

Hence if a*b*c<0 and a+b+c>0

This implies one of the variables can be negative an the other two positive

Now just assume a is negative and b and c are +ve

Then

mod(a)/a=-1

mod(b)/b=1

mod(c)/c=1

Now

x=1-1+1

x=1

done..

Now just calculate the value of the function

1+16-7=10

Please click like if you do understand

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