Предмет: Алгебра, автор: Аннушка2013

решить неравенство 4x²+10x-20≤(x+2)²

Ответы

Автор ответа: Julia1995sidorova

4x^2+10x-20<=(x+2)^2

4x^2+10x-20<=x^2+4x+4

3x^2+6x-24<=0 /3(все выражение разделила на 3)

х^2+2x-8<=0

д=4+32=36=6

x1=-4

x2=2

x - [-4;2]

Ответ: [-4;2]

наверное так

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