СРОЧНО!!!

Имеет ли действительные корни уровнение:

1) х^4 - 6х^2 + 10 = 0;

2) х^4 - 12х^2 + 36 = 0;

3)х^4 - 3х^2 - 4 = 0;

4)х^4 - 10х^2 + 26 = 0?

заранее спасибо ^^
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