已知a²-4a+2=0,则a+2/a=_,a³-14a=_

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已知a²-4a+2=0,则a+2/a=___,a³-14a=___
已知a²-4a+2=0,则a+2/a=___,a³-14a=___

已知a²-4a+2=0,则a+2/a=___,a³-14a=___
a²-4a+2=0
a-4+2/a=0
a+2/a=4
a²-4a+2=0
a²-4a=-2
a³-14a
=a³-4a²+4a²-14a
=a(a²-4a)+4a²-14a
=-2a+4a²-14a
=4a²-16a
=4(a²-4a)
=4*(-2)
=-8