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Q.

If a, b(a>b) are points of discontinuity of the function 

⨍ (x)=3-2x2,x02x+3,0<x12x2-3x    ,1<x<22x-3,2x<3xx3 then 

3a - b= _____ 

 

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answer is 5.

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Detailed Solution

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LHL at x=0  ltx0 3-2x2=3-0=3 }  f(x) is

RHL at x=0  ltx0 2x+3=3 } conti at x=0

 

LHL at x=1  ltx1 2x+3=5 }  f(x) is

RHL at x=1  ltx1 2x2-3x=2-3=-1 } dis conti at x=1

 

LHL at x=2  ltx2 2x2-3x=8-6=2 } f(x) is

RHL at x=2  ltx2 2x-3=4-3=1 } at x=2

 

LHL at x=3  ltx3 2x-3=6-3=3 } f(x) is conti 

RHL at x=3 ltx3 |x|=3 } at x=3

 f(x) dis continuous at x=1, 2

a=2   b=1     3a-b=6-1=5

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