(t+1)(t-8)-t^2=t^2-8t+t-8-t^2=-7t-8=-7*-8-8=56-8=48
(t+1)(t-8)-t2=
t2-8t+t-8-t2 зачеркиваем t2 и -t2 как противоположные, получаем
-7t-8, подставляем t=-8
-7-8-8=-7
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(t+1)(t-8)-t^2=t^2-8t+t-8-t^2=-7t-8=-7*-8-8=56-8=48
(t+1)(t-8)-t2=
t2-8t+t-8-t2 зачеркиваем t2 и -t2 как противоположные, получаем
-7t-8, подставляем t=-8
-7-8-8=-7