Solve each of the following in equations and represent the solution set on the number line.

0, x ϵ R. –{–2, 2}


Given:


≥ 0, x ϵ R. – {–2, 2}


Intervals of |x|:


x ≥ 0, |x| = x and x < 0, |x| = -x


Domain of ≥ 0


is not defined for x = -2 and x = 2


Therefore, Domain: x < -2 or -2 < x < 2 or x > 2


Combining intervals with domain:


x<-2, -2<x<0, 0 ≤ x<2, x>2


For x < -2:



≥ 0


Signs of – x – 1:


-x -1 = 0 x = -1


(Adding 1 to both the sides and then dividing by -1 on both the sides)


-x – 1> 0 x < -1


(Adding 1 to both the sides and then multiplying by -1 on both the sides)


-x – 1 < 0 x > -1


(Adding 1 to both the sides and then multiplying by -1 on both the sides)


Signs of – x – 2:


-x -2 = 0 x = -2


(Adding 2 to both the sides and then dividing by -1 on both the sides)


-x – 2> 0 x < -2


(Adding 2 to both the sides and then multiplying by -1 on both the sides)


-x – 2 < 0 x > -2


(Adding 2 to both the sides and then multiplying by -1 on both the sides)


Intervals satisfying the required condition: ≥ 0


x < - 2 or x = -1 or x > -1


Merging overlapping intervals:


x < -2 or x ≥ -1


Combining the intervals:


x < -2 or x ≥ -1 and x < -2


Merging overlapping intervals:


x < -2


Similarly, for -2 < x < 0:



≥ 0


Therefore,


Intervals satisfying the required condition: ≥ 0


x < - 2 or x = -1 or x > -1


Merging overlapping intervals:


x < -2 or x ≥ -1


Combining the intervals:


x < -2 or x ≥ -1 and -2 < x < 0


Merging overlapping intervals:


-1 ≤ x < 0


For 0 ≤ x < 2,



≥ 0


Signs of x – 1:


x – 1 = 0 x = 1(Adding 1 to both the sides)


x – 1 > 0 x > 1(Adding 1 to both the sides)


x – 1 < 0 x < 1(Adding 1 to both the sides)


Signs of x – 2:


x – 2 = 0 x = 2(Adding 2 to both the sides)


x – 2 < 0 x < 2(Adding 2 to both the sides)


x – 2 > 0 x > 2(Adding 2 to both the sides)


At x = 2, is not defined


Intervals satisfying the required condition: ≥ 0


x < 1 or x = 1 or x > 2


Merging overlapping intervals:


x ≤ 1 or x > 2


Combining the intervals:


x ≤ 1 or x > 2 and 0 ≤ x < 2


Merging overlapping intervals:


0 ≤ x ≤ 1


Similarly, for x > 2:



≥ 0


Therefore,


Intervals satisfying the required condition: ≥ 0


x < 1 or x = 1 or x > 2


Merging overlapping intervals:


x ≤ 1 or x > 2


Combining the intervals:


x ≤ 1 or x > 2 and x > 2


Merging overlapping intervals:


x > 2


Combining all the intervals:


x < -2 or -1 ≤ x < 0 or 0 ≤ x ≤ 1 or x >2


Merging the overlapping intervals:


x < -2 or -1 ≤ x ≤ 1 or x > 2


Therefore,


x ϵ (-∞, -2) Ս [-1,1] Ս (2, ∞)


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