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= 16a²+5b
b) 9a-a²-6a-(-a²) = 9a-a²-6a+a² = 9a-6a-a²+a²
= 3a
c) x²-2x-(-3x²)-3+(-x)-9 = x²-2x+3x²-3-x-9 = x²+3x²-2x-x-3-9
= 4x²-3x-12
d) -3ab+5bc-(-2bc)-ab = -3ab+5bc+2bc-ab = -3ab-ab+5bc+2bc
= -4ab+7bc
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= 7a² + 9a² + 5b
= 16a² + 5b
b. 9a - a² - 6a - ( -a² )
= 9a - a² - 6a + a²
= 9a - 6a - a² + a²
= 3a
c. x² - 2x - ( -3x² ) - 3 + ( -x ) - 9
= x² - 2x + 3x² - 3 - x -9
= x² + 3x² - 2x - x - 3 - 9
= 4x² - 3x - 12
d. 3ab - 9 + ( -7ba ) - a
= 3ab - 9 - 7ba - a
= 3ab - 7ba - a - 9
= -4ab - a - 9
e. -3ab + 5bc - ( -2bc ) - ab
= -3ab + 5bc + 2bc - ab
= -3ab - ab + 5bc + 2bc
= -4ab + 7bc