7. Add 5x³+12²-4x+16 to the product of 7x²-4x-5 and 3x-2
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Product of 7x²-4x-5 and 3x-2
(7x²-4x-5)( 3x-2)
21x³-12x²-15x-14x²+8x+10
21x³-12x²-14x²-15x+8x+10
21x³-26x²-7x+10
(5x³+12x²-4x+16)+(21x³-26x²-7x+10)
5x³+21x³+12x²-26x²-4x-7x+16+10
26x³-14x²-11x+26 Ans
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