f (x)= (6-x)^2=(6-x)*(6-x)=36-6x-6x+x^2=36-12x+x^2
f(x)= (2x+5)^2=(2x+5)*(2x+5)=4x^2+10x+10x+25=4x^2+20x+25
f(x)= (7-x*3)^2=(7-3x)^2=(7-3x)*(7-3x)=49-21x-21x+9x^2=49-42x+9x^2
binomische Normalform:
(a+b)^2=(a+b*(a+b)=a^2+ab+ba+b^2=a^2+2ab+b^2
(a-b)^2=(a-b)*(a-b)=a^2-ab-ba+b^2=a^2-2ab+b^2