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naaa00
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Homework Statement
Hello there!
I'm trying to find the roots of the following cubic polynomial
x^3 - 10x + 18 = 0
The Attempt at a Solution
I did the following: I rewrite 18 as
18 = - (x^3 - 10x)
then I did back substitution and factored out
x^3 - 10x - x^3 + 10x = 0 or x(x^2-10) - x(x^2-10) = 0
=> (x - x)(x^2-10) = 0
=> x = sqrt(10)
I'm not sure if what I did is legit and correct. I think is wrong.
Is it valid?
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