[latex]a) \ 9-x^2=0 \ x^2=9 \ x=-3 lor x=3 \ oxed{x in {-3, 3 } } \ \ b) \ 5x^2=125 \ x^2=25 \ x=-5 lor x=5 \ oxed{x in { -5, 5} } \ \ c) \ x^2-5x=0 \ x(x-5)=0 \ x=0 lor x-5=0 \ x=0 lor x=5 \ oxed{x in { 0, 5} } \ \ d) \ 4x-3x^2=0 \ x(4-3x)=0 \ x=0 lor 4-3x=0 \ x=0 lor 3x=4 \ x=0 lor x=frac{4}{3} \ oxed{x in {0, frac{4}{3} } }[/latex] Jeśli tam jest plus: [latex]e) \ x^2+7x+6=0 \ x^2+6x+x+6=0 \ x(x+6)+1(x+6)=0 \ (x+1)(x+6)=0 \ x+1=0 lor x+6=0 \ x=-1 lor x=-6 \ oxed{x in {-6, -1 } }[/latex] Jeśli jest minus: [latex]x^2-7x+6=0 \ x^2-6x-x+6=0 \ x(x-6)-1(x-6)=0 \ (x-1)(x-6)=0 \ x-1=0 lor x-6=0 \ x=1 lor x=6 \ oxed{x in { 1, 6 }}[/latex] [latex]f) \ x^2-12x+36=0 \ x^2-2 cdot 6 cdot x+ 6^2=0 \ (x-6)^2=0 \ x-6=0 \ oxed{x=6}[/latex]
