Question

Dados A = ( 3x + 5y )² ; Y = ( 6x – 7y ) ² ; C = ( 5x + 3y ) ( 5x – 3y ) e D = 4x – (– 3y + 1) + (– 3x + 1), calcule o valor de:
a) A – B + C
b) (A – C) . D

Answer 1

a) A+B-C   (3x+5y)²-(6x-7y)²+(5x+3y)(5x-3y)   9x²+30xy+25y²-36x²-84xy+49y²+25x²-9y²   -2x²+144xy-33y²
b)(A-C)xD  [(3x+5y)²-(5x+3y)(5x-3y)]4x-(-3y+1)+(-3x+1)  (9x²+30xy+25y²-25x²+9y²)4x+3y-1-3x+1  (-16x²+30xy+31y²)4x+3y-1-3x+1  -64x³+120x²y+136xy²+3y-1-3x+1  -64x²+120x²y+136xy²+3y-3x