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a)
(-12 abc - 4 a²bc) - (abc + a²bc) + 12 =
= -12abc - 4a²bc - abc - a²bc + 12 =
= -13 abc - 5a²bc + 12
c)
( 5x² - ax + a²) - ( -3x² - 2ax - 3a²) =
= 5x² - ax + a² + 3x² + 2ax + 3a² =
= 4a² + ax + 8x²
e)
( 4x²y² + 7xy²) - (3xy + 13xy²) - ( 5x²y² + 5xy) + x²y² =
= 4x²y² + 7xy² - 3xy - 13xy² - 5x²y² - 5xy + x²y² =
= - 8xy - 6 xy²
g)
-4 (4a + 2b) + 3 (5b - 7a) =
= -16 a - 8b + 15b - 21a = - 37 a + 7b
h)
(a - 2) (a + 5) = a² + 5a - 2a - 10 = 3a + a² - 10
i)
(4 + x ) ( x - 8) = 4x - 32 + x² - 8x = -4x + x² - 32