|x-1|<=1 -> -1 <=x -1<=+1 -->

-1+1 <=x-1+1 <= +1+1

0 <=x <=2

-->|x+4|=x+4 para 0 <=x <=2

0+4 <=x+4 <=2+4

4 <=x+4 <=6

valor major :6

b) |x^2-16|<=9

-9 <=x^2-16 <=9

-9+16 <= x^2-16+16 <= 9+16

7 <=x^2 <=25

Sistema

{ x^2>=7

{ x^2 <25

{ x <=-raiz (7) V x>= +raiz (7)

{ -5 <=x <= +5

Grafico

____-5_______-V7________V7_____5_______

_______________●...............●______________........●___________________________●..........

-5 <=x <= -raiz7 V raiz 7 <=x <= 5

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