-(2z+7)(2z-7)-4(5z-3)^2

-(2z+7)(2z-7)-4(5z-3)^2 = -4z^2+49-4(25z^2-30z+9)= -4z^2+49-100z^2+120z-36= -104z^2+120z+13

hey . = -(2z+7)(2z-7)-4(5z-3)^2 = -{4z(kwadrat}-49}-{40z-24}= -4z{kwadrat}+49-40z+24= -4z{ kwadrat }-40z+73