Question

Determine o valor de x

Answer 1

Vamos là

Pitágoras

(x + 2)² = (x + 1)² + x²

x² + 4x + 4 = x² + 2x + 1 + x²

x² - 2x - 3 = 0

d² = 4 + 12 = 16, d = 4

x = (2 + 4)/2 = 3

x + 2 = 5, x + 1 = 4, x = 3

Answer 2

x + 1 + x + 2 + x = 90
3x = 90 - 3
3x = 87
x = 87 : 3
x = 29