已知x2-3x-5=0,求x3-14x+15的值

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已知x2-3x-5=0,求x3-14x+15的值已知x2-3x-5=0,求x3-14x+15的值已知x2-3x-5=0,求x3-14x+15的值x2-3x-5=0x²-3x=5x3-14x+

已知x2-3x-5=0,求x3-14x+15的值
已知x2-3x-5=0,求x3-14x+15的值

已知x2-3x-5=0,求x3-14x+15的值
x2-3x-5=0
x²-3x=5
x3-14x+15
=x(x²-3x)+3x²-14x+15
=3x²-9x+15
=3(x²-3x)+15
=3×5+15
=30

x2-3x-5=0 x²-3x=5 x3-14x+15 =x(x²-3x)+3x²-14x+15 =3x²-9x+15 =3(x²-3x)+15 =3×5+15 =20

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