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deschideti parantezele si reduceti termenii asemenea -4(t-5)+20(t-5)²

Răspuns :

-4t+20+20(t²-10t+25)=
-4t+20+20t²-200t+500=
20t²-204t+520

-4t+20+20(t²-10t+25)= 20t²-204t+520