x^4+8x^2+15= x^4+5x^2+3x^2+15=x^2(x^2+5)3(x^2+5)=(x^2+5)(x^2+3)
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x^4+8x^2+15= x^4+5x^2+3x^2+15=x^2(x^2+5)3(x^2+5)=(x^2+5)(x^2+3)