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We can factor the fourth degree trinomial $a^4+5a^2+9$ by applying the substitution: $y=^2$
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$y^2+5y+9$
Learn how to solve polynomial factorization problems step by step online. Factor by completing the square a^4+5a^2+9. We can factor the fourth degree trinomial a^4+5a^2+9 by applying the substitution: y=^2. Add and subtract \displaystyle\left(\frac{b}{2a}\right)^2. Factor the perfect square trinomial y^2+5y+\frac{25}{4}. Subtract the values 9 and -\frac{25}{4}.