Предмет: Алгебра, автор: maskalina83

Упростите выражение: (3а+2)2-12а
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Автор ответа: miron2077

исходное не пишу
9а²+12а+4-12а=9а²+4

Автор ответа: maskalina83

Подскажите, а почему 12а повторяется 2 раза только с разными знаками?

Автор ответа: miron2077

первое +12а это при возведении в квадрат (3а+2) по формуле квадрата суммы, а второе -12а из условия. Одинаковые члены с противоположными знаками сократили

Автор ответа: maskalina83

Спасибо!

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