Предмет: Математика, автор: Nika056897

Решите пожалуйста, тут два примера

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Автор ответа: erzhan9210

(x+4)²-(x-10)²≤4x²-564
x²+8x+16-x²+20x-100-4x²+564≤0
-4x²+28x+480≤0
x²-7x-120≥0
D=7²-4(-120)=49+480=529=23²
x=(7±23)/2
x1=30/2=15
x2=-16/2=-8
ответ (-беск;-8] и [15; +беск)

Автор ответа: valenivan

Решение приложено. Смотри файл.

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