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Автор - ggggg7123

Решите уравнения различными способами.

x2+6x+8=0

Ответ

Автор - lunic14
1 способ
2x + 6x +8 =0
2x + 6x = 0 - 8
8x = - 8
x = - 8 : 8
x = - 1

Ответ

Автор - rina2403k

1.) \ x {}^{2}  + 4x + 2x + 8 = 0 \ x(x + 4) + 2(x + 4) = 0 \ (x + 4)(x + 2) = 0 \ x + 4 = 0 \ x + 2 = 0 \ x =  - 4 \ x  =  - 2 \ 2.) \ x {}^{2}  + 6x + 8 = 0 \ d = b {}^{2}  - 4ac = 6 {}^{2}  - 4 times 8 = 36 - 32 = 4 \  sqrt{4 }  = 2 \ x1 =  frac{ - 6 - 2}{2}  =  frac{ - 8}{2}  =  - 4 \ x2 =  frac{ - 6 + 2}{2}  =  frac{ - 4}{2}  =  - 2

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