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= (2x+7x)+(5+4)
= 9x+9
2. = (2x+7x)+(5-4)
= 9x + 1
3. = (2x+7x)-(5-4)
= 9x-1
4. 14x^2 + 8x + 35x +20
= 7x + 7x + 15 + 4
= 14x + 19
2. (2x + 5) + (7x - 4) = 2x + 5 + 7x - 4
= 2x + 7x + 5 - 4
= 9x + 1
3. (2x + 5) - (7x - 4) = 2x + 5 - 7x + 4
= 2x - 7x + 5 + 4
= -5x + 9
4. (2x + 5)(7x + 4) = 14x² + 8x + 35x + 20
= 14x² + 43x + 20