Exercise 19 Page 32

How many cases do we have after we remove the absolute value?

Solutions: b=6 and b=- 3.5
Number Line:

Practice makes perfect

An absolute value measures an expression's distance from a midpoint on a number line. |4b-5|= 19 This equation means that the distance is 19, either in the positive direction or the negative direction. |4b-5|= 19 ⇒ l4b-5= 19 4b-5= - 19 To find the solutions to the absolute value equation, we need to solve both of these cases for b.

| 4b-5|=19

lc 4b-5 ≥ 0:4b-5 = 19 & (I) 4b-5 < 0:4b-5 = - 19 & (II)

lc4b-5=19 & (I) 4b-5=- 19 & (II)

(I), (II): LHS+5=RHS+5

l4b=24 4b=- 14

(I), (II): .LHS /4.=.RHS /4.

lb=6 b= -144

ReduceFrac

(II):a/b=.a /2./.b /2.

lb=6 b= -72

MoveNegNumToFrac

(II):Put minus sign in front of fraction