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3(x +2) -(7(x +9))
3x +6 -(7x +63)
3x +6 -7x -63
3x -7x +6 -63
-4x -57
b. 5(x² -4x +2) -(-2(x² +x -1))
5x² -20x +10 -(-2x² -2x +1)
5x² -20x +10 +2x² +2x -1
5x² +2x² -20x +2x +10 -1
7x² -18x +9
b. 5x² - 20x + 10 - (-2x²-2x+1) = 5x² - 20x + 10 + 2x² + 2x -1 = 7x² - 18x + 9