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Anonymous
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yes five is a facto of twenty..! 5X4=20
x^5+2x^4+4x^2+2x-3
20
no. 6x8 =48. 5x4 + 1x4 =20 + 4 =24.
5x4 - 2x = x*(5x3 - 2) and that cannot be factorised further without invoking surds.