c) ( - b + 12) ( 5 b -6) - ( - 3 b +1) ( - b + 12) c = ( - 5 b² + 6 b + 60 b - 72) - ( 3 b² - 36 b -b + 12) c = - 5 b² + 66 b - 72 - 3 b² + 36 b + b - 12 c = - 8 b² 103 b - 84
d = ( 2 x² - 11 x - 6 x + 33 ) + ( - x² + 3 x + 18 x - 54) d = 2 x² - 17 x + 33 - x² + 21 x - 54 d = x² + 4 x - 21
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Bonsoirc) ( - b + 12) ( 5 b -6) - ( - 3 b +1) ( - b + 12)
c = ( - 5 b² + 6 b + 60 b - 72) - ( 3 b² - 36 b -b + 12)
c = - 5 b² + 66 b - 72 - 3 b² + 36 b + b - 12
c = - 8 b² 103 b - 84
d = ( 2 x² - 11 x - 6 x + 33 ) + ( - x² + 3 x + 18 x - 54)
d = 2 x² - 17 x + 33 - x² + 21 x - 54
d = x² + 4 x - 21
e = 3 y ⁴ - y² + 18 y² - 6 + ( 6 y² - 9 y⁴ - 2 + 3y²)
e = 3 y⁴ + 16 y² - 6 + 6 y² - 9 y ⁴ - 2 + 3y²
e = - 6 y⁴ + 25 y² - 8
f = x³ - x² + 3 x - 3 + x² - 2 x + 1
f = x ³ + x - 2