Предмет: Алгебра, автор: alinamusaevna

Упростите выражение и найдите его значение: 5а(а^3 - 4a) - 4a (a^2-5a) при а= --3

Ответы

Автор ответа: noob91

2

5а(а^3 - 4a) - 4a (a^2-5a)= 5а⁴-20а²-4а³+20а²=

5а⁴-4а³ при а=-3

= 5×(-3)⁴-4(-3)³= 5×81- 4×(-27)= 405- (-108)= 513

с начала упростить потом уже

заменять а на -3

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