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উৎপাদকে বিশ্লেষণ কর: $x^4+x^2-20$

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$x^4+x^2-20$

$=x^4+5x^2-4x^2-20$

$=x^2(x^2+5)-4(x^2+5)$

$=(x^2+5)(x^2-4)$ [Answer]

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