show that the polynomial x^4+4x^2+5 has no real zero
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a=1,b=4,c=5
b²-4ac=4²-4×1×5
=16-20=-4
D=√-4
so polynomial has no real roots because discriminante is negative
b²-4ac=4²-4×1×5
=16-20=-4
D=√-4
so polynomial has no real roots because discriminante is negative
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