Subtract:
x3 - 4x - 1 from 3x3 - x2 + 6
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3x3 - x2 + 6 - (x3 - 4x - 1)
= 3x3 - x2 + 6 - x3 + 4x + 1
Arrange the polynomial with like terms together and combine them.
= (3x3 - x3) - x2 + 4x + (6 + 1)
= 2x3 - x2 + 4x + 7
Hence, 3x3 - x2 + 6 - (x3 - 4x - 1) = 2x3 - x2 + 4x + 7
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