x²-x-1=0 then prof that x6-4x³-1= 0
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x6-4x³-1
= (x²)³-(1)³-4x³
=(x²-1²)³+3x².1(x²-1)-4x³
=x³+3x².x-4x³ [ °.° x²-1=x ]
=x³+3x³-4x³
=4x³-4x³= 0
proved
x6-4x³-1
= (x²)³-(1)³-4x³
=(x²-1²)³+3x².1(x²-1)-4x³
=x³+3x².x-4x³ [ °.° x²-1=x ]
=x³+3x³-4x³
=4x³-4x³= 0
proved
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