Предмет: Алгебра, автор: makasinyakayaka

упростите выражение 5a(a-2)-(a-5)^2 и найдите его значение при а= -4.
Напишите решение.

makasinyakayaka: Напишите пожалуйста

Ответы

Автор ответа: Rechnung
2
5a(a-2)-(a-5)^2=5a^2-10a-(a^2-10a+25)=\\\\=5a^2-10a-a^2+10a-25=4a^2-25\\\\a=-4\\4(-4)^2-25=4*16-25=64-25=39
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