. Does the polynomial a4 + 4a2 + 5 = 0 have real zeroes?
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Answer:
In the aforementioned equation, let a2 = x.
Now, the equation becomes,
x2 + 4x2 + 5 = 0
Here, b2 – 4ac will be = 42 – 4(1)(5) = 16 – 20 = -4
So, D = b2 – 4ac < 0
As the discriminant (D) is negative, the given polynomial does not have real roots or zeroes.
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