Автор - zhannakit12468

Найдите k из тождественного равенства x3+6x2+kx+12=(x+4)(x2+ax+3)

Ответ

Автор - zinaidazina

x^3+6x^2+kx+12=(x+4)(x^2+ax+3)

x^3+6x^2+kx+12=x^3+4x^2+ax^2+4ax+3x+12

x^3+6x^2+kx+12=x^3+(4+a)x^2+(4a+3)x+12

left { {{4+a=6} atop {4a+3=k}} right.

left { {{a=6-4} atop {k=4a+3}} right.

left { {{a=2} atop {k=4a+3}} right.

\ left { {{a=2} atop {k=4*2+3}} right.

k=4*2+3

k=8+3

k=11

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