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2. =5x² - x + 25x - 5
=5x²+24x - 5
3. =14x - 49 - 4x² + 14x
=-4x² + 28x -49
2.5x^2-x+25x-5
=5x^2+24x-5
3.14x-49-4x^2+14x
=28x-4x^2-49