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(6x^3-5x)-(9x^3+8x+2)
Vertically
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(6x^3-5x)-(9x^3+8x+2)
First write out the polynomial, leaving gaps as required
6x^3 -5x
9x^3 +8x +2
Then change the signs in the second part of the polynomial to ensure that the –ve sign outside the bracket is catered for, and then add.
6x^3 -5x
-9x^3 -8x -2
-3x^3 -13x -2
So the answer is
-3x^3-13x-2
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