find and evaluate the sum
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x²-5x+1
a=1, b=-5, c=1
using formula :x= -b±√b²-4ac /2a
=5±√21 /2
=5+4.58 /2, 5-4.58 /2
=4.79, 0.21
x²+ 1/x²
=4.79²+ 1/4.79²
=22.94+ 0.04
=22.98
x²+ 1/x²
=0.21²+ 1/0.21²
=0.0441+ 22.6757
=22.7198
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