substrct :2x-8x²-9 from 5x²+3x+4
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2x-8x²-9 from 5x²+3x+4
(5x²+3x+4) - (2x-8x²-9)
=5x²+3x+4 - 2x+8x²+9
=13x²+x+13 (Ans)
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