add the following terms
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i) 5x-6y, 8x+7y, -4x+3y
= (5x - 6y) + (8x + 7y) + ( - 4x + 3y)
=5x - 6y + 8x + 7y - 4x + 3y
= (5x + 8x - 4x) + (7y + 3y - 6y)
= 9x + 4y(Ans)
ii)6x³+8+7x-8x², 3x²-9-8x, 3x-x²+2x³
=(6x³+8+7x-8x²) + (3x²-9-8x) + (3x-x²+2x³)
=6x³+8+7x-8x² + 3x²-9-8x + 3x-x²+2x³
=(6+2)x³ + (3-8-1)x² + (7+3-8)x + (8-9)
=8x³ - 6x² + 2x - 1(Ans)
(In the above two answers the powers of x and y are in descending order)
Hope it helps you..
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