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Mathematics
Evelin Browning
19 November, 11:49
Find the real roots of the equation x^4-5x^2-36=0
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Lea Hicks
19 November, 12:36
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Treat x^4 as the square of p: x^4 = p^2.
Then x^4 - 5x^2 - 36 = 0 becomes p^2 - 5p - 36 = 0.
This factors nicely, to (p-9) (p+4) = 0. Then p = 9 and p = - 4.
Equating 9 and x^2, we find that x=3 or x=-3.
Equating - 4 and x^2, we see that there's no real solution.
Show that both x=3 and x=-3 are real roots of x^4 - 5x^2 - 36 = 0.
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