Question 1200923
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All the real zeros of the given polynomial are integers. Find the zeros. 
(Enter your answers as a comma-separated list. Enter all answers including repetitions.)

P(x) = x^4 − 10x^2 + 9

x =

Write the polynomial in factored form.

P(x) =

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<pre>
Make the decomposition / (factoring) in two steps


(1)  x^4 - 10x^2 + 9 = (x^2-9)*(x^2-1)   (as if you factor mentally a quadratic polynomial).


(2)  Next, factor each of the participating quadratic polynomials separately

           x^2 - 10x^2 + 9 = (x^2-9)*(x^2-1) = (x+3)*(x-3)*(x+1)*(x-1).
</pre>

Done.