Предмет: Математика, автор: КиСлАя555

Помогите решить неравенства) На вас вся надежда

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Автор ответа: anassstass

а) 7(4х - 3) - 4(8х - 7) ≥ 0
28х - 21 - 32х + 28 ≥ 0
-4х + 7 ≥ 0
-4х ≥ -7
х ≤ 4/7
_/_/_/_/_/_/_/_/_4/7_________>х
Ответ: (-∞; 4/7]

б) (х + 7)² - 4 ≥ (х + 6)² - 3
х² + 14х + 49 - 4 ≥ х² + 12х + 36 - 3
2х + 12 ≥ 0
2х ≥ -12
х ≥ -6
__________-6_/_/_/_/_/_/_/_/_>х
Ответ: [-6; +∞)

КиСлАя555: Спасибо огромное) Оказалось, что все не так уж сложно. Наверное после лета мозги не включились ещё :ь Ещё раз спасибо :*

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