求解x³-7x²-17x-9=0,

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求解x³-7x²-17x-9=0,求解x³-7x²-17x-9=0,求解x³-7x²-17x-9=0,y(x)=x^3-7x^2-17x-9

求解x³-7x²-17x-9=0,
求解x³-7x²-17x-9=0,

求解x³-7x²-17x-9=0,
y(x)=x^3-7x^2-17x-9=0 (1)
y=x^3-7x^2-17x-9
=(x+1)(x^2-8x-9)
=(x-9)(x+1)^2 =0 (2)
即:
x1,2=-1 (2重根) x3=9 (3)