Question

Resolva as equações onde f(x) é: f(-2) f(-1) f(0) f(1) f(2)
a} f(x) = |x|+2x
b} f(x) = |x+3| - |x-5|

Answer 1

f(x) = = |x|+2x

f(-2) = |-2|+2(-2) ==> 2-4==> - 2
f(-1) = |-1|+2(-1) ==> 1-2==> - 1
f(0) =  |0|+2(0) ==> 0-0==> 0
f(1) =  |1|+2(1) ==> 1+2==> 3
f(2)=   |2|+2(2) ==> 2+4==> 6======================================================
b} f(x) = |x+3| - |x-5|

f(-2) = |-2+3| - |-2-5|= |+1| - |-7|= 1-7 ==> - 6
f(-1) = |-1+3| - |-1-5|= |+2| - |-6|= 2-6 ==> - 4
f(0) =  |0+3| - |0-5|= |+3| - |-5|= 3-5 ==> - 2
f(1) =  |1+3| - |1-5|= |+4| - |-4|= 4-4 ==> 0
f(2) =  |2+3| - |2-5|= |+5| - |-3|= 5-3 ==> 2