by actual division,shiw that x²-3 is a factor of 2x⁴+3x³-2x²-9x-12
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x²-3) 2x⁴+3x³-2x²-9x-12. (2x²+3x+4
+-2x⁴. ±6x²
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3x³+4x²-9x-12
+-3x³. ±9x
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4x²-12
+-4x²±12
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0
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As remainder is 0, x²-3 is a factor of 2x⁴+3x³-2x²-9x-22
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