Obwód = 2x + 2 x + 5 = 4x + 20
Obwód = 2x + 2 x + 5 = 4x + 20
x(x + 5) = 300
x(x + 5) = 300
x(x + 5) = 300 x 2 + 5x 300 = 0
x(x + 5) = 300 x 2 + 5x 300 = 0 (x 15)(x + 20) = 0
x(x + 5) = 300 x 2 + 5x 300 = 0 (x 15)(x + 20) = 0 x = 15 x = 20
x(x + 5) = 300 x 2 + 5x 300 = 0 (x 15)(x + 20) = 0 x = 15 x = 20
x(x + 5) = 300 x 2 + 5x 300 = 0 (x 15)(x + 20) = 0 x = 15 x = 20
Cena = 4 15 + 10 30 = 80 30 = 2400 x(x + 5) = 300 x 2 + 5x 300 = 0 (x 15)(x + 20) = 0 x = 15 x = 20
Cena = 4 15 + 10 30 = 70 30 = 2400 x(x + 5) = 300 x 2 + 5x 300 = 0 x = 15 x = 20
Cena = 4 15 + 10 30 = 70 30 = 2100 x(x + 5) = 300 x 2 + 5x 300 = 0 (x 15)(x + 20) = 0 x = 15 x = 20
Cena = 4 15 + 10 30 = 70 30 = 2100 x(x + 5) = 300 x 2 + 5x 300 = 0 (x 15)(x + 20) = 0 x = 15 x = 20 Odpowiedź: Właściciel zapłacił 2100 zł.