Question

add using horizontal method : 4x³- 3x²-x+3 , 7+2x+5x²-3x³ , -4x²-9x and -7-x²-x³

Answer 1

4x^3 -3x^2 -x +3

-3x^3 +5x^2 +2x+7

-4x^2 -9x

-x^3 -x^2 -7

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-3x^2-8x+3