Odpowiedzi

2010-03-30T22:52:57+02:00

1. (x-2)(x+2)-(x-2)kwadrat = -y

(x-2)(x+2)-(x-2)² = -y
x²-4-(x²-4x+4) = -y
x²-4-x²+4x-4 = -y
4x-8 = -y
y = 8-4x

2. (y+1)kwadrat-x(4x+2) = (y+2x)(y-2x)+3x
(y+1)² - x(4x+2) = (y+2x)(y-2x)+3x
y²+2y+1-4x²-2x = y²-4x²+3x
y²-y²-4x²+4x²+2y+1-2x = 3x
2y = 3x+2x-1
2y = 5x-1