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Mathematics
Problem
Which of the following polynomial functions can never take negative values for any real
x
x
x
? a)
x
6
−
1
x^{6}-1
x
6
−
1
b)
4
x
4
4x^{4}
4
x
4
c)
−
2
x
6
-2x^{6}
−
2
x
6
d)
x
4
−
4
x
2
x^{4}-4x^{2}
x
4
−
4
x
2
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