0
Anonymous
2x4 - 7x3 + x2 + 7x - 3
= (x + 1)(2x3 - 9x2 + 10x - 3)
= (x + 1)(x - 1)(2x2 -7x + 3)
= (x + 1)(x - 1)(x - 3)(2x -1)
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It is 20 because (7x3)-6 +5 =20 7x3=21 21-6=15 15+5=20.