What is the solution of 2l2x-1l-8=18?

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 What is the solution of 2l2x-1l-8=18?
 
Ax=27/4 or x=7
Bx=-6 or x=7
Cx=9/4 or x=27/4
Dx=-6 or x=27/4
 What is the solution of l4X-6l>14
 
A.x<-8 or x>20
B.x<-2 or x>5
C.x<-5 or x>5
D.x>-2 or x<5

May 6th, 2015

2I2x-1I-8=18

l2x-1l=13

lf(x)l=a gives f(x)=-a  or f(x)=a

Hence, 2x-1=-13 or 2x-1=13

so, x=-6 or x=-7

Hence, b.

……………………………………………………………………..

|4x-6|>14

lf(x)l=a gives f(x)=-a  or f(x)=a

4x-6>14 or 4x-6<14

x>5 or x<-2

Hence, B. x<-2 or x>5


May 6th, 2015

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May 6th, 2015
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