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15-09-2020
Mathematics

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please help me solve these questions. at least 2. (i)

please help me solve these questions at least 2 i class=

Respuesta :

ChoiSungHyun ChoiSungHyun

15-09-2020

Step-by-step explanation:

x^2 + 4x + 8 = (x^2 + 4x + 4) + 4 = (x + 2)^2 + 4.

When x^2 + 4x + 8 > 5, this means (x + 2)^2 + 4 > 5.

So (x + 2)^2 > 1.

=> (x + 2) > 1 or (x + 2) < -1.

=> x > -1 or x < -3.

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