Respostas

2014-06-10T16:45:08-03:00
23 * 12 = 276m²
(23+x) * (12+x) = 476
276 + 23x + 12x + x² = 476
x² + 35x -200 = 0

Delta= (35)² - 4*1*-200 = 0
Delta= 1225 +800 = 2025

Raiz de 2025 = 45

x= -35 +-45/2

x' = -35+45/2 = 5
x" = -35-45/2 = -40

2 5 2