Question

Considere A=5y2-3y+5, B= -3y2- 8y+3, C=4y2-13 e D= 6y2-7y+9, e calcule (A-C)-(B-D).

Answer 1

(A-C) = [(5y²-3y+5)-(4y²-13)] = (5y²-4y²-3y+5+13) = y²-3y+18
(B-D) = [(-3y²-8y+3)-(6y²-7y+9)] = -3y²-6y²-8y+7y+3-9 = -9y²-y-6
(A-C)-(B-D) = (y²-3y+18)-(-9y²-y-6) = y²+9y²-3y+y+18+6 = 10y²-2y+24