Răspuns:
f(x)=2x+1
a)x=2x+1
x-2x=1
-x=1
x= -1
f(-1)= -1
(-1,-1)
b)x=f(x)/2
x=(2x+1)/2
2x=2x+1
0=1 Imposibil
c)f(x)=x/3
2x+1=x/3
6x+3=x
6x-x=-3
5x= -3
x=-3/5
f(-3/5)=2*(-3/5)+1= -6/5+1= -1/5
(-3/5;-1/5)
d)x=2f(x)
x=2(2x+1)
x=4x+2
-3x=2
x=-2/3
f(-2/3)=2*(-2/3)+1=
-4/3+1= -1/3
(-2/3,-1/3)
e)lxl=l2x+1l
a)x=2x+1
-x=1 x= -1
f(-1)= -1
(-1,-1)
-x=2x+1
-3x=1
x= -1/3
f(-1/3)=-2/3+1=1/3
l-1/3l=l1/3l
x=-2x-1
x= -1
y= -1 a fost analizat
Explicație pas cu pas: