Question

Elimine o módulo em |x-1| + |x+2|

Answer 1

Resposta:

x-1=0 ==>raiz = 1

x+2=0 ==>raiz =-2

--------------------(-2)------------------------(1)------------------------

Se x≥1 ==>x-1+x+2= 2x+1

Se  -2 ≤ x < 1 ==>  -(x-1) +x+2 = -x+1+x+2 = 3

Se x<-2 ==> -(x-1)-(x+2) =-2x+1