1. Zapisz w postaci iloczynu z2-8z+16= 9b2-16a2=

[latex]z^2-8z+16=z^2-8z+4^2=(z-4)^2 \ \ 9b^2-16a^2= (3b)^2-(4a)^2= (3b-4a)(3b+4a)[/latex]