28. From the sum of 5x ^ 2 - 7x + 4 and - 3x ^ 2 + 5x + 2sub x ^ 2 + x + 1
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Answer:
given, [(4+3x)+(5−4x+2x
2
)]−[(3x
2
−5x)+(−x
2
+2x+5)]
=(2x
2
−x+9)−(2x
2
−3x+5)
=2x+4
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