Here's the last one
Here's the second one:
Hallo guest, here the first one.
4a+4b=4*(a+b) Die 4 wurde ausgeklammert.
f(-3)=-3^2+3=-9+3=-6
but
f(-3)=(-3)^2=9+3=12
Hallo guest!
x*2y=2xy
Hallo Gast!
